<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e3b80-2b32-767d-a303-3863b3a89362,g:5984937f-5024-48f8-b515-406992b37c1c-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://capitalbankmd.com/role/ConsolidatedStatementsofIncomeunaudited" xlink:type="simple" xlink:href="cbnk-20260630.xsd#ConsolidatedStatementsofIncomeunaudited"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/ConsolidatedStatementsofIncomeunaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019e3b80-2f71-7ada-8b7b-ca8a1b7e63ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019e3b80-2f70-71a1-9499-2d11b4c4f54c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019e3b80-2f71-7ada-8b7b-ca8a1b7e63ea" xlink:to="loc_us-gaap_StatementTable_019e3b80-2f70-71a1-9499-2d11b4c4f54c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019e3b80-2f70-7aef-b6e7-9bd81158d43d" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019e3b80-2f70-71a1-9499-2d11b4c4f54c" xlink:to="loc_srt_ProductOrServiceAxis_019e3b80-2f70-7aef-b6e7-9bd81158d43d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e3b80-2f70-7aef-b6e7-9bd81158d43d_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019e3b80-2f70-7aef-b6e7-9bd81158d43d" xlink:to="loc_srt_ProductsAndServicesDomain_019e3b80-2f70-7aef-b6e7-9bd81158d43d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e3b80-2f70-788e-9b96-53eeffb875df" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019e3b80-2f70-7aef-b6e7-9bd81158d43d" xlink:to="loc_srt_ProductsAndServicesDomain_019e3b80-2f70-788e-9b96-53eeffb875df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BankServicingMember_019e3b80-2f70-78f5-9bd4-829f2efa4e4b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BankServicingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e3b80-2f70-788e-9b96-53eeffb875df" xlink:to="loc_us-gaap_BankServicingMember_019e3b80-2f70-78f5-9bd4-829f2efa4e4b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditCardMember_019e3b80-2f70-72e0-abf9-c88f42977d3f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditCardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e3b80-2f70-788e-9b96-53eeffb875df" xlink:to="loc_us-gaap_CreditCardMember_019e3b80-2f70-72e0-abf9-c88f42977d3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBankingMember_019e3b80-2f70-72c3-8aed-617c84bf8012" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageBankingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e3b80-2f70-788e-9b96-53eeffb875df" xlink:to="loc_us-gaap_MortgageBankingMember_019e3b80-2f70-72c3-8aed-617c84bf8012" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_GovernmentLendingMember_019e3b80-2f71-7682-9cad-aa7fb0205ab1" xlink:href="cbnk-20260630.xsd#cbnk_GovernmentLendingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e3b80-2f70-788e-9b96-53eeffb875df" xlink:to="loc_cbnk_GovernmentLendingMember_019e3b80-2f71-7682-9cad-aa7fb0205ab1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_GovernmentLoanServicingMember_019e3b80-2f71-7485-b0ad-58b7826bac31" xlink:href="cbnk-20260630.xsd#cbnk_GovernmentLoanServicingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e3b80-2f70-788e-9b96-53eeffb875df" xlink:to="loc_cbnk_GovernmentLoanServicingMember_019e3b80-2f71-7485-b0ad-58b7826bac31" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_019e3b80-2f71-7d8f-ab94-3a274e4f7db6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestAndDividendIncomeOperatingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e3b80-2f71-7ada-8b7b-ca8a1b7e63ea" xlink:to="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_019e3b80-2f71-7d8f-ab94-3a274e4f7db6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndFeeIncomeLoansAndLeases_019e3b80-2f71-749c-897e-bea07ac31844" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestAndFeeIncomeLoansAndLeases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_019e3b80-2f71-7d8f-ab94-3a274e4f7db6" xlink:to="loc_us-gaap_InterestAndFeeIncomeLoansAndLeases_019e3b80-2f71-749c-897e-bea07ac31844" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeDebtSecuritiesAvailableForSaleOperating_019e3b80-2f71-79f2-a34b-5fa6ed64b875" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeDebtSecuritiesAvailableForSaleOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_019e3b80-2f71-7d8f-ab94-3a274e4f7db6" xlink:to="loc_us-gaap_InterestIncomeDebtSecuritiesAvailableForSaleOperating_019e3b80-2f71-79f2-a34b-5fa6ed64b875" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeFederalFundsSold_019e3b80-2f71-7351-b5d6-d00865c47f70" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeFederalFundsSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_019e3b80-2f71-7d8f-ab94-3a274e4f7db6" xlink:to="loc_us-gaap_InterestIncomeFederalFundsSold_019e3b80-2f71-7351-b5d6-d00865c47f70" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeOperating_019e3b80-2f71-7e50-a6f4-c649b186b2bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestAndDividendIncomeOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_019e3b80-2f71-7d8f-ab94-3a274e4f7db6" xlink:to="loc_us-gaap_InterestAndDividendIncomeOperating_019e3b80-2f71-7e50-a6f4-c649b186b2bc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseAbstract_019e3b80-2f71-7f3d-8055-59ca8e83bfe3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e3b80-2f71-7ada-8b7b-ca8a1b7e63ea" xlink:to="loc_us-gaap_InterestExpenseAbstract_019e3b80-2f71-7f3d-8055-59ca8e83bfe3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDeposits_019e3b80-2f71-757a-9607-a7c5deabf794" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseDeposits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestExpenseAbstract_019e3b80-2f71-7f3d-8055-59ca8e83bfe3" xlink:to="loc_us-gaap_InterestExpenseDeposits_019e3b80-2f71-757a-9607-a7c5deabf794" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseBorrowings_019e3b80-2f71-7b0e-bdf9-6d2620e6f90c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestExpenseAbstract_019e3b80-2f71-7f3d-8055-59ca8e83bfe3" xlink:to="loc_us-gaap_InterestExpenseBorrowings_019e3b80-2f71-7b0e-bdf9-6d2620e6f90c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseOperating_019e3b80-2f71-7f5a-ab79-1087228cb470" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestExpenseAbstract_019e3b80-2f71-7f3d-8055-59ca8e83bfe3" xlink:to="loc_us-gaap_InterestExpenseOperating_019e3b80-2f71-7f5a-ab79-1087228cb470" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_019e3b80-2f71-7c1d-b83f-0d0378104a49" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e3b80-2f71-7ada-8b7b-ca8a1b7e63ea" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_019e3b80-2f71-7c1d-b83f-0d0378104a49" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal_019e3b80-2f71-7c9e-a1ab-53101cbab4d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e3b80-2f71-7ada-8b7b-ca8a1b7e63ea" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal_019e3b80-2f71-7c9e-a1ab-53101cbab4d1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_UnfundedCommitmentsCreditLossExpenseReversal_019e3b80-2f71-7df6-a614-e881b5a8b3bc" xlink:href="cbnk-20260630.xsd#cbnk_UnfundedCommitmentsCreditLossExpenseReversal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e3b80-2f71-7ada-8b7b-ca8a1b7e63ea" xlink:to="loc_cbnk_UnfundedCommitmentsCreditLossExpenseReversal_019e3b80-2f71-7df6-a614-e881b5a8b3bc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_019e3b80-2f71-7d9b-93fe-1b247d86c1bb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e3b80-2f71-7ada-8b7b-ca8a1b7e63ea" xlink:to="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_019e3b80-2f71-7d9b-93fe-1b247d86c1bb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncomeAbstract_019e3b80-2f71-7c66-93c6-feb13f5e934a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestIncomeAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e3b80-2f71-7ada-8b7b-ca8a1b7e63ea" xlink:to="loc_us-gaap_NoninterestIncomeAbstract_019e3b80-2f71-7c66-93c6-feb13f5e934a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_019e3b80-2f71-7014-8f8d-ded5919355c1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_019e3b80-2f71-7c66-93c6-feb13f5e934a" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_019e3b80-2f71-7014-8f8d-ded5919355c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_NoninterestIncomeServicingAsset_019e3b80-2f71-7b99-84d9-af7d336d3a3d" xlink:href="cbnk-20260630.xsd#cbnk_NoninterestIncomeServicingAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_019e3b80-2f71-7c66-93c6-feb13f5e934a" xlink:to="loc_cbnk_NoninterestIncomeServicingAsset_019e3b80-2f71-7b99-84d9-af7d336d3a3d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncomeOtherOperatingIncome_019e3b80-2f71-7329-8e58-dd8f85005989" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestIncomeOtherOperatingIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_019e3b80-2f71-7c66-93c6-feb13f5e934a" xlink:to="loc_us-gaap_NoninterestIncomeOtherOperatingIncome_019e3b80-2f71-7329-8e58-dd8f85005989" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncome_019e3b80-2f71-7ca1-91e1-34c0ce8cbc93" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_019e3b80-2f71-7c66-93c6-feb13f5e934a" xlink:to="loc_us-gaap_NoninterestIncome_019e3b80-2f71-7ca1-91e1-34c0ce8cbc93" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpenseAbstract_019e3b80-2f71-7654-9bd1-d53af935e846" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e3b80-2f71-7ada-8b7b-ca8a1b7e63ea" xlink:to="loc_us-gaap_NoninterestExpenseAbstract_019e3b80-2f71-7654-9bd1-d53af935e846" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_019e3b80-2f71-7e7f-8e9a-b6c34b76201f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_019e3b80-2f71-7654-9bd1-d53af935e846" xlink:to="loc_us-gaap_LaborAndRelatedExpense_019e3b80-2f71-7e7f-8e9a-b6c34b76201f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OccupancyAndEquipmentExpense_019e3b80-2f71-77c8-b41f-baa6a1d5ec63" xlink:href="cbnk-20260630.xsd#cbnk_OccupancyAndEquipmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_019e3b80-2f71-7654-9bd1-d53af935e846" xlink:to="loc_cbnk_OccupancyAndEquipmentExpense_019e3b80-2f71-77c8-b41f-baa6a1d5ec63" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfessionalFees_019e3b80-2f71-7a10-99a0-04ed8a28ea37" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfessionalFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_019e3b80-2f71-7654-9bd1-d53af935e846" xlink:to="loc_us-gaap_ProfessionalFees_019e3b80-2f71-7a10-99a0-04ed8a28ea37" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InformationTechnologyAndDataProcessing_019e3b80-2f71-7fc1-b1fc-3f4a2b508e6a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InformationTechnologyAndDataProcessing"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_019e3b80-2f71-7654-9bd1-d53af935e846" xlink:to="loc_us-gaap_InformationTechnologyAndDataProcessing_019e3b80-2f71-7fc1-b1fc-3f4a2b508e6a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdvertisingExpense_019e3b80-2f71-73fe-8c14-be80d3af53f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdvertisingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_019e3b80-2f71-7654-9bd1-d53af935e846" xlink:to="loc_us-gaap_AdvertisingExpense_019e3b80-2f71-73fe-8c14-be80d3af53f3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanProcessingFee_019e3b80-2f71-7a9b-bcf3-fc91628bb8af" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoanProcessingFee"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_019e3b80-2f71-7654-9bd1-d53af935e846" xlink:to="loc_us-gaap_LoanProcessingFee_019e3b80-2f71-7a9b-bcf3-fc91628bb8af" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019e3b80-2f71-71a0-ba26-5261b6902e38" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_019e3b80-2f71-7654-9bd1-d53af935e846" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019e3b80-2f71-71a0-ba26-5261b6902e38" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OperationalAndOtherIncomeLoss_019e3b80-2f71-7c0a-8299-9a302b51ba87" xlink:href="cbnk-20260630.xsd#cbnk_OperationalAndOtherIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_019e3b80-2f71-7654-9bd1-d53af935e846" xlink:to="loc_cbnk_OperationalAndOtherIncomeLoss_019e3b80-2f71-7c0a-8299-9a302b51ba87" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_RegulatoryAssessmentsExpense_019e3b80-2f71-71db-914a-8beeb5ad9e2d" xlink:href="cbnk-20260630.xsd#cbnk_RegulatoryAssessmentsExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_019e3b80-2f71-7654-9bd1-d53af935e846" xlink:to="loc_cbnk_RegulatoryAssessmentsExpense_019e3b80-2f71-71db-914a-8beeb5ad9e2d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoninterestExpense_019e3b80-2f71-70e2-b2d2-d4db782bebb9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherNoninterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_019e3b80-2f71-7654-9bd1-d53af935e846" xlink:to="loc_us-gaap_OtherNoninterestExpense_019e3b80-2f71-70e2-b2d2-d4db782bebb9" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpense_019e3b80-2f71-7da2-bc9a-764b08576f45" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_019e3b80-2f71-7654-9bd1-d53af935e846" xlink:to="loc_us-gaap_NoninterestExpense_019e3b80-2f71-7da2-bc9a-764b08576f45" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019e3b80-2f71-7114-ae47-0f9241e736ad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e3b80-2f71-7ada-8b7b-ca8a1b7e63ea" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019e3b80-2f71-7114-ae47-0f9241e736ad" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019e3b80-2f71-75de-99d8-a34822aa0d47" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e3b80-2f71-7ada-8b7b-ca8a1b7e63ea" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019e3b80-2f71-75de-99d8-a34822aa0d47" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e3b80-2f71-79d5-9f37-750e60d9f767" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e3b80-2f71-7ada-8b7b-ca8a1b7e63ea" xlink:to="loc_us-gaap_NetIncomeLoss_019e3b80-2f71-79d5-9f37-750e60d9f767" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_019e3b80-2f71-758e-88c5-d15f5b4295e9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e3b80-2f71-7ada-8b7b-ca8a1b7e63ea" xlink:to="loc_us-gaap_EarningsPerShareBasic_019e3b80-2f71-758e-88c5-d15f5b4295e9" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_019e3b80-2f71-79b3-b0bf-7cfd521025a6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e3b80-2f71-7ada-8b7b-ca8a1b7e63ea" xlink:to="loc_us-gaap_EarningsPerShareDiluted_019e3b80-2f71-79b3-b0bf-7cfd521025a6" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_019e3b80-2f71-7b91-87e5-f378cadbd1af" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e3b80-2f71-7ada-8b7b-ca8a1b7e63ea" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_019e3b80-2f71-7b91-87e5-f378cadbd1af" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019e3b80-2f71-759c-83b0-9bd965fa182b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_019e3b80-2f71-7b91-87e5-f378cadbd1af" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019e3b80-2f71-759c-83b0-9bd965fa182b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019e3b80-2f71-75f8-adf1-3445d7cfb4d8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_019e3b80-2f71-7b91-87e5-f378cadbd1af" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019e3b80-2f71-75f8-adf1-3445d7cfb4d8" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/ConsolidatedStatementsofChangesinStockholdersEquityunaudited" xlink:type="simple" xlink:href="cbnk-20260630.xsd#ConsolidatedStatementsofChangesinStockholdersEquityunaudited"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/ConsolidatedStatementsofChangesinStockholdersEquityunaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019e3b80-2f71-76fd-937e-f32404a550d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019e3b80-2f71-73d9-8cb9-0f1246ede98d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019e3b80-2f71-76fd-937e-f32404a550d0" xlink:to="loc_us-gaap_StatementTable_019e3b80-2f71-73d9-8cb9-0f1246ede98d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019e3b80-2f71-761e-89d7-7d7cbb76fba5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019e3b80-2f71-73d9-8cb9-0f1246ede98d" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019e3b80-2f71-761e-89d7-7d7cbb76fba5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e3b80-2f71-761e-89d7-7d7cbb76fba5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e3b80-2f71-761e-89d7-7d7cbb76fba5" xlink:to="loc_us-gaap_EquityComponentDomain_019e3b80-2f71-761e-89d7-7d7cbb76fba5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e3b80-2f71-79c8-b498-e3fc8e2e4b90" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e3b80-2f71-761e-89d7-7d7cbb76fba5" xlink:to="loc_us-gaap_EquityComponentDomain_019e3b80-2f71-79c8-b498-e3fc8e2e4b90" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019e3b80-2f71-76c8-907e-87a1dfb708e9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e3b80-2f71-79c8-b498-e3fc8e2e4b90" xlink:to="loc_us-gaap_CommonStockMember_019e3b80-2f71-76c8-907e-87a1dfb708e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019e3b80-2f71-7f8f-81be-27ad5fae5e20" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e3b80-2f71-79c8-b498-e3fc8e2e4b90" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019e3b80-2f71-7f8f-81be-27ad5fae5e20" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019e3b80-2f71-7ba9-89d5-50815a609751" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e3b80-2f71-79c8-b498-e3fc8e2e4b90" xlink:to="loc_us-gaap_RetainedEarningsMember_019e3b80-2f71-7ba9-89d5-50815a609751" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e3b80-2f71-761e-8846-2c69772cc8da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e3b80-2f71-79c8-b498-e3fc8e2e4b90" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e3b80-2f71-761e-8846-2c69772cc8da" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3b80-2f71-7143-b63f-7d768b72518b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e3b80-2f71-76fd-937e-f32404a550d0" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3b80-2f71-7143-b63f-7d768b72518b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019e3b80-2f71-78c3-bdbe-5ef47c27d862" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3b80-2f71-7143-b63f-7d768b72518b" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019e3b80-2f71-78c3-bdbe-5ef47c27d862" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e3b80-2f71-7e44-a950-07f6eb2959a2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3b80-2f71-7143-b63f-7d768b72518b" xlink:to="loc_us-gaap_StockholdersEquity_019e3b80-2f71-7e44-a950-07f6eb2959a2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e3b80-2f71-7c65-af2f-7dfb7a184965" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3b80-2f71-7143-b63f-7d768b72518b" xlink:to="loc_us-gaap_NetIncomeLoss_019e3b80-2f71-7c65-af2f-7dfb7a184965" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent_019e3b80-2f71-7f63-a92d-986ea7b99281" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3b80-2f71-7143-b63f-7d768b72518b" xlink:to="loc_us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent_019e3b80-2f71-7f63-a92d-986ea7b99281" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodNetOfSharesWithheldForPurchasePrice_019e3b80-2f71-7439-b3e1-064f8bd8ae30" xlink:href="cbnk-20260630.xsd#cbnk_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodNetOfSharesWithheldForPurchasePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3b80-2f71-7143-b63f-7d768b72518b" xlink:to="loc_cbnk_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodNetOfSharesWithheldForPurchasePrice_019e3b80-2f71-7439-b3e1-064f8bd8ae30" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_StockIssuedDuringPeriodValueStockOptionsExercisedNetOfSharesWithheldForPurchasePrice_019e3b80-2f71-76f1-a57b-f1bd80b0359b" xlink:href="cbnk-20260630.xsd#cbnk_StockIssuedDuringPeriodValueStockOptionsExercisedNetOfSharesWithheldForPurchasePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3b80-2f71-7143-b63f-7d768b72518b" xlink:to="loc_cbnk_StockIssuedDuringPeriodValueStockOptionsExercisedNetOfSharesWithheldForPurchasePrice_019e3b80-2f71-76f1-a57b-f1bd80b0359b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_SharesIssuedSharesShareBasedPaymentArrangementAfterForfeitureIncludingAdjustmentsToRetainedEarnings_019e3b80-2f71-773b-828d-a6fcad3803b7" xlink:href="cbnk-20260630.xsd#cbnk_SharesIssuedSharesShareBasedPaymentArrangementAfterForfeitureIncludingAdjustmentsToRetainedEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3b80-2f71-7143-b63f-7d768b72518b" xlink:to="loc_cbnk_SharesIssuedSharesShareBasedPaymentArrangementAfterForfeitureIncludingAdjustmentsToRetainedEarnings_019e3b80-2f71-773b-828d-a6fcad3803b7" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_SharesIssuedValueShareBasedPaymentArrangementAfterForfeitureIncludingAdjustmentsToRetainedEarnings_019e3b80-2f71-745a-8265-9d2f15cdd92a" xlink:href="cbnk-20260630.xsd#cbnk_SharesIssuedValueShareBasedPaymentArrangementAfterForfeitureIncludingAdjustmentsToRetainedEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3b80-2f71-7143-b63f-7d768b72518b" xlink:to="loc_cbnk_SharesIssuedValueShareBasedPaymentArrangementAfterForfeitureIncludingAdjustmentsToRetainedEarnings_019e3b80-2f71-745a-8265-9d2f15cdd92a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019e3b80-2f71-74ab-b1b8-77e618d54d51" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3b80-2f71-7143-b63f-7d768b72518b" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019e3b80-2f71-74ab-b1b8-77e618d54d51" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockCash_019e3b80-2f71-7f00-94ef-9018676270ac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsCommonStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3b80-2f71-7143-b63f-7d768b72518b" xlink:to="loc_us-gaap_DividendsCommonStockCash_019e3b80-2f71-7f00-94ef-9018676270ac" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_019e3b80-2f71-70cf-8833-13d43ecf3797" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3b80-2f71-7143-b63f-7d768b72518b" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_019e3b80-2f71-70cf-8833-13d43ecf3797" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_019e3b80-2f71-7af7-944f-d8ed499b9374" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e3b80-2f71-7143-b63f-7d768b72518b" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_019e3b80-2f71-7af7-944f-d8ed499b9374" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019e3b80-2f71-7c5d-ae8b-5d833a2730bf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e3b80-2f71-78ec-bdff-c3d03c35a7a0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/NatureofBusinessandBasisofPresentationDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#NatureofBusinessandBasisofPresentationDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/NatureofBusinessandBasisofPresentationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_AccountingPoliciesLineItems_019e3b80-301c-7a1f-9ca5-17f66816049b" xlink:href="cbnk-20260630.xsd#cbnk_AccountingPoliciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_AccountingPoliciesTable_019e3b80-301c-73db-8ab1-d77e63f4761e" xlink:href="cbnk-20260630.xsd#cbnk_AccountingPoliciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_cbnk_AccountingPoliciesLineItems_019e3b80-301c-7a1f-9ca5-17f66816049b" xlink:to="loc_cbnk_AccountingPoliciesTable_019e3b80-301c-73db-8ab1-d77e63f4761e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_019e3b80-301c-79cb-8c98-eb1b177f53c4" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cbnk_AccountingPoliciesTable_019e3b80-301c-73db-8ab1-d77e63f4761e" xlink:to="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_019e3b80-301c-79cb-8c98-eb1b177f53c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019e3b80-301c-79cb-8c98-eb1b177f53c4_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MortgageLoansOnRealEstateNamePropertyTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_019e3b80-301c-79cb-8c98-eb1b177f53c4" xlink:to="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019e3b80-301c-79cb-8c98-eb1b177f53c4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019e3b80-301c-7d63-85f4-1bb13e6a4434" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MortgageLoansOnRealEstateNamePropertyTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_019e3b80-301c-79cb-8c98-eb1b177f53c4" xlink:to="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019e3b80-301c-7d63-85f4-1bb13e6a4434" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_CommercialBankBranchMember_019e3b80-301c-78e0-b759-4f72be86cf27" xlink:href="cbnk-20260630.xsd#cbnk_CommercialBankBranchMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019e3b80-301c-7d63-85f4-1bb13e6a4434" xlink:to="loc_cbnk_CommercialBankBranchMember_019e3b80-301c-78e0-b759-4f72be86cf27" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_MortgageBankingOfficeMember_019e3b80-301c-7f05-95e7-4fe9d5ee048c" xlink:href="cbnk-20260630.xsd#cbnk_MortgageBankingOfficeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019e3b80-301c-7d63-85f4-1bb13e6a4434" xlink:to="loc_cbnk_MortgageBankingOfficeMember_019e3b80-301c-7f05-95e7-4fe9d5ee048c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_LoanProductionOfficeMember_019e3b80-301c-7747-a52c-b2348938a33e" xlink:href="cbnk-20260630.xsd#cbnk_LoanProductionOfficeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019e3b80-301c-7d63-85f4-1bb13e6a4434" xlink:to="loc_cbnk_LoanProductionOfficeMember_019e3b80-301c-7747-a52c-b2348938a33e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_GovernmentLoanServicingOfficeMember_019e3b80-301c-7bc2-b527-9e49ccabde6e" xlink:href="cbnk-20260630.xsd#cbnk_GovernmentLoanServicingOfficeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019e3b80-301c-7d63-85f4-1bb13e6a4434" xlink:to="loc_cbnk_GovernmentLoanServicingOfficeMember_019e3b80-301c-7bc2-b527-9e49ccabde6e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_CreditCardOperationsOfficeMember_019e3b80-301c-7cdb-8477-cd8e09bf880e" xlink:href="cbnk-20260630.xsd#cbnk_CreditCardOperationsOfficeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019e3b80-301c-7d63-85f4-1bb13e6a4434" xlink:to="loc_cbnk_CreditCardOperationsOfficeMember_019e3b80-301c-7cdb-8477-cd8e09bf880e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_NumberOfAdditionalDivisions_019fb2fa-97fd-7a64-b8b6-a56a4289802e" xlink:href="cbnk-20260630.xsd#cbnk_NumberOfAdditionalDivisions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbnk_AccountingPoliciesLineItems_019e3b80-301c-7a1f-9ca5-17f66816049b" xlink:to="loc_cbnk_NumberOfAdditionalDivisions_019fb2fa-97fd-7a64-b8b6-a56a4289802e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_NumberOfBankOfficesAndBranches_019e3b80-301c-7032-a76e-84c8e39115c4" xlink:href="cbnk-20260630.xsd#cbnk_NumberOfBankOfficesAndBranches"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbnk_AccountingPoliciesLineItems_019e3b80-301c-7a1f-9ca5-17f66816049b" xlink:to="loc_cbnk_NumberOfBankOfficesAndBranches_019e3b80-301c-7032-a76e-84c8e39115c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_019e3b80-301c-7360-95b1-86001fd046d7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbnk_AccountingPoliciesLineItems_019e3b80-301c-7a1f-9ca5-17f66816049b" xlink:to="loc_us-gaap_NumberOfReportableSegments_019e3b80-301c-7360-95b1-86001fd046d7" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/InvestmentSecuritiesAmortizedcosttoEstimatedFairValueDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#InvestmentSecuritiesAmortizedcosttoEstimatedFairValueDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/InvestmentSecuritiesAmortizedcosttoEstimatedFairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3b80-301c-713d-a5f1-3b5ddd1e1f0b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e3b80-301c-79ae-9fc7-e25bbd743f0e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3b80-301c-713d-a5f1-3b5ddd1e1f0b" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e3b80-301c-79ae-9fc7-e25bbd743f0e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e3b80-301c-7ca5-87bc-4ba373121708" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e3b80-301c-79ae-9fc7-e25bbd743f0e" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e3b80-301c-7ca5-87bc-4ba373121708" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-7ca5-87bc-4ba373121708_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e3b80-301c-7ca5-87bc-4ba373121708" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-7ca5-87bc-4ba373121708_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-7f00-bfff-11bc74d4a5d8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e3b80-301c-7ca5-87bc-4ba373121708" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-7f00-bfff-11bc74d4a5d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasurySecuritiesMember_019e3b80-301c-71a0-85c6-b6313a4064e4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USTreasurySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-7f00-bfff-11bc74d4a5d8" xlink:to="loc_us-gaap_USTreasurySecuritiesMember_019e3b80-301c-71a0-85c6-b6313a4064e4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MunicipalBondsMember_019e3b80-301c-78f7-a852-f12826bdcfca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MunicipalBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-7f00-bfff-11bc74d4a5d8" xlink:to="loc_us-gaap_MunicipalBondsMember_019e3b80-301c-78f7-a852-f12826bdcfca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019e3b80-301c-77c6-997b-67b6e4e7e096" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-7f00-bfff-11bc74d4a5d8" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019e3b80-301c-77c6-997b-67b6e4e7e096" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019e3b80-301c-7498-a6cb-f996214a4a37" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-7f00-bfff-11bc74d4a5d8" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019e3b80-301c-7498-a6cb-f996214a4a37" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesMember_019e3b80-301c-7186-97d2-9e9845ff141f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-7f00-bfff-11bc74d4a5d8" xlink:to="loc_us-gaap_MortgageBackedSecuritiesMember_019e3b80-301c-7186-97d2-9e9845ff141f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_019e3b80-301c-781c-9d70-cf9d82d9ab68" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3b80-301c-713d-a5f1-3b5ddd1e1f0b" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_019e3b80-301c-781c-9d70-cf9d82d9ab68" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019e3b80-301c-7e20-a48c-54bc24107c49" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3b80-301c-713d-a5f1-3b5ddd1e1f0b" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019e3b80-301c-7e20-a48c-54bc24107c49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019e3b80-301c-70f7-8649-8944b4ed41e3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3b80-301c-713d-a5f1-3b5ddd1e1f0b" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019e3b80-301c-70f7-8649-8944b4ed41e3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest_019e3b80-301c-74e8-8074-48e554e589d7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3b80-301c-713d-a5f1-3b5ddd1e1f0b" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest_019e3b80-301c-74e8-8074-48e554e589d7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019e3b80-301c-714c-b17d-c13bcb647d56" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3b80-301c-713d-a5f1-3b5ddd1e1f0b" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019e3b80-301c-714c-b17d-c13bcb647d56" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/InvestmentSecuritiesNarrativeDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#InvestmentSecuritiesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/InvestmentSecuritiesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3b80-301c-7f1d-abec-9a1e6c289d6f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e3b80-301c-7cde-b169-b035afb6ca42" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3b80-301c-7f1d-abec-9a1e6c289d6f" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e3b80-301c-7cde-b169-b035afb6ca42" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityAxis_019e3b80-301c-7e31-a0e3-462b0d79e3a8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e3b80-301c-7cde-b169-b035afb6ca42" xlink:to="loc_us-gaap_LineOfCreditFacilityAxis_019e3b80-301c-7e31-a0e3-462b0d79e3a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_019e3b80-301c-7e31-a0e3-462b0d79e3a8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_019e3b80-301c-7e31-a0e3-462b0d79e3a8" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_019e3b80-301c-7e31-a0e3-462b0d79e3a8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_019e3b80-301c-789b-b8e6-a6f757d2e4a1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_019e3b80-301c-7e31-a0e3-462b0d79e3a8" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_019e3b80-301c-789b-b8e6-a6f757d2e4a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_FederalHomeLoanBankMember_019e3b80-301c-78a7-94cf-e2573b1d3308" xlink:href="cbnk-20260630.xsd#cbnk_FederalHomeLoanBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLenderDomain_019e3b80-301c-789b-b8e6-a6f757d2e4a1" xlink:to="loc_cbnk_FederalHomeLoanBankMember_019e3b80-301c-78a7-94cf-e2573b1d3308" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_FederalReserveBankMember_019fc77d-0b3e-70d5-9aa7-b2603e8e6868" xlink:href="cbnk-20260630.xsd#cbnk_FederalReserveBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLenderDomain_019e3b80-301c-789b-b8e6-a6f757d2e4a1" xlink:to="loc_cbnk_FederalReserveBankMember_019fc77d-0b3e-70d5-9aa7-b2603e8e6868" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralAxis_019e3b80-301c-7e79-9ee6-a74d37ca9a3c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e3b80-301c-7cde-b169-b035afb6ca42" xlink:to="loc_us-gaap_CollateralAxis_019e3b80-301c-7e79-9ee6-a74d37ca9a3c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralDomain_019e3b80-301c-7e79-9ee6-a74d37ca9a3c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CollateralAxis_019e3b80-301c-7e79-9ee6-a74d37ca9a3c" xlink:to="loc_us-gaap_CollateralDomain_019e3b80-301c-7e79-9ee6-a74d37ca9a3c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralDomain_019e3b80-301c-79a7-805d-e9fe91667173" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CollateralAxis_019e3b80-301c-7e79-9ee6-a74d37ca9a3c" xlink:to="loc_us-gaap_CollateralDomain_019e3b80-301c-79a7-805d-e9fe91667173" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralPledgedMember_019e3b80-301c-79eb-937e-b652e719f851" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralPledgedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CollateralDomain_019e3b80-301c-79a7-805d-e9fe91667173" xlink:to="loc_us-gaap_CollateralPledgedMember_019e3b80-301c-79eb-937e-b652e719f851" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e3b80-301c-7da3-912f-42663c09993f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e3b80-301c-7cde-b169-b035afb6ca42" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e3b80-301c-7da3-912f-42663c09993f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-7da3-912f-42663c09993f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e3b80-301c-7da3-912f-42663c09993f" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-7da3-912f-42663c09993f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-75eb-838b-c82e87c2db38" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e3b80-301c-7da3-912f-42663c09993f" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-75eb-838b-c82e87c2db38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasurySecuritiesMember_019e3b80-301c-72ec-b307-ee35efe51d14" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USTreasurySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-75eb-838b-c82e87c2db38" xlink:to="loc_us-gaap_USTreasurySecuritiesMember_019e3b80-301c-72ec-b307-ee35efe51d14" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MunicipalBondsMember_019e3b80-301c-7b74-a78f-271ff7b0837b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MunicipalBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-75eb-838b-c82e87c2db38" xlink:to="loc_us-gaap_MunicipalBondsMember_019e3b80-301c-7b74-a78f-271ff7b0837b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesMember_019e3b80-301c-754c-ba6c-69abfc8e0533" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-75eb-838b-c82e87c2db38" xlink:to="loc_us-gaap_MortgageBackedSecuritiesMember_019e3b80-301c-754c-ba6c-69abfc8e0533" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019e3b80-301c-7ba1-8cd5-c866b1448007" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-75eb-838b-c82e87c2db38" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019e3b80-301c-7ba1-8cd5-c866b1448007" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019e3b80-301c-7bf6-bc9b-bd3330aac809" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-75eb-838b-c82e87c2db38" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019e3b80-301c-7bf6-bc9b-bd3330aac809" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e3b80-301c-7bfc-b836-d0eecbc7497a" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e3b80-301c-7cde-b169-b035afb6ca42" xlink:to="loc_srt_RangeAxis_019e3b80-301c-7bfc-b836-d0eecbc7497a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e3b80-301c-7bfc-b836-d0eecbc7497a_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019e3b80-301c-7bfc-b836-d0eecbc7497a" xlink:to="loc_srt_RangeMember_019e3b80-301c-7bfc-b836-d0eecbc7497a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e3b80-301c-7015-8dfa-3c66a40e93cb" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019e3b80-301c-7bfc-b836-d0eecbc7497a" xlink:to="loc_srt_RangeMember_019e3b80-301c-7015-8dfa-3c66a40e93cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e3b80-301c-7668-8bdb-eeab9472f1bf" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e3b80-301c-7015-8dfa-3c66a40e93cb" xlink:to="loc_srt_MinimumMember_019e3b80-301c-7668-8bdb-eeab9472f1bf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e3b80-301c-70f8-bf71-4df56b574b7f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e3b80-301c-7015-8dfa-3c66a40e93cb" xlink:to="loc_srt_MaximumMember_019e3b80-301c-70f8-bf71-4df56b574b7f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CreditRatingStandardPoorsAxis_019e3b80-301c-7a6c-8f3e-68a34936ea3d" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CreditRatingStandardPoorsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e3b80-301c-7cde-b169-b035afb6ca42" xlink:to="loc_srt_CreditRatingStandardPoorsAxis_019e3b80-301c-7a6c-8f3e-68a34936ea3d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ExternalCreditRatingStandardPoorsMember_019e3b80-301c-7a6c-8f3e-68a34936ea3d_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ExternalCreditRatingStandardPoorsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CreditRatingStandardPoorsAxis_019e3b80-301c-7a6c-8f3e-68a34936ea3d" xlink:to="loc_srt_ExternalCreditRatingStandardPoorsMember_019e3b80-301c-7a6c-8f3e-68a34936ea3d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ExternalCreditRatingStandardPoorsMember_019e3b80-301c-75b8-9789-0f3fd05a9437" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ExternalCreditRatingStandardPoorsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CreditRatingStandardPoorsAxis_019e3b80-301c-7a6c-8f3e-68a34936ea3d" xlink:to="loc_srt_ExternalCreditRatingStandardPoorsMember_019e3b80-301c-75b8-9789-0f3fd05a9437" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StandardPoorsAAARatingMember_019e3b80-301c-73bb-a166-26593cf887cc" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StandardPoorsAAARatingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ExternalCreditRatingStandardPoorsMember_019e3b80-301c-75b8-9789-0f3fd05a9437" xlink:to="loc_srt_StandardPoorsAAARatingMember_019e3b80-301c-73bb-a166-26593cf887cc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StandardPoorsAAPlusRatingMember_019e3b80-301c-786b-9ea5-8009c9b2320b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StandardPoorsAAPlusRatingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ExternalCreditRatingStandardPoorsMember_019e3b80-301c-75b8-9789-0f3fd05a9437" xlink:to="loc_srt_StandardPoorsAAPlusRatingMember_019e3b80-301c-786b-9ea5-8009c9b2320b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_DebtSecuritiesAvailableForSaleNumberOfSecuritiesSold_019e3b80-301c-7874-ba69-b2d5157fb7e9" xlink:href="cbnk-20260630.xsd#cbnk_DebtSecuritiesAvailableForSaleNumberOfSecuritiesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3b80-301c-7f1d-abec-9a1e6c289d6f" xlink:to="loc_cbnk_DebtSecuritiesAvailableForSaleNumberOfSecuritiesSold_019e3b80-301c-7874-ba69-b2d5157fb7e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest_019e3b80-301c-715d-9835-9399a113a9a1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3b80-301c-7f1d-abec-9a1e6c289d6f" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest_019e3b80-301c-715d-9835-9399a113a9a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecurityOwnedAndPledgedAsCollateralAssociatedLiabilitiesFairValue_019e3b80-301c-797e-ae3d-53b782271f1a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecurityOwnedAndPledgedAsCollateralAssociatedLiabilitiesFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3b80-301c-7f1d-abec-9a1e6c289d6f" xlink:to="loc_us-gaap_SecurityOwnedAndPledgedAsCollateralAssociatedLiabilitiesFairValue_019e3b80-301c-797e-ae3d-53b782271f1a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsFairValueDisclosure_019e3b80-301c-7c51-a300-6be46af8d657" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3b80-301c-7f1d-abec-9a1e6c289d6f" xlink:to="loc_us-gaap_InvestmentsFairValueDisclosure_019e3b80-301c-7c51-a300-6be46af8d657" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions_019e3b80-301c-7391-8440-c6c8dbab5a14" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3b80-301c-7f1d-abec-9a1e6c289d6f" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions_019e3b80-301c-7391-8440-c6c8dbab5a14" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions_019e3b80-301c-7c63-baa5-c74120e3319f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3b80-301c-7f1d-abec-9a1e6c289d6f" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions_019e3b80-301c-7c63-baa5-c74120e3319f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubordinatedDebt_019e3b80-301c-7e3c-9fc5-5f29ad76c590" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubordinatedDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3b80-301c-7f1d-abec-9a1e6c289d6f" xlink:to="loc_us-gaap_SubordinatedDebt_019e3b80-301c-7e3c-9fc5-5f29ad76c590" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableModificationToTotalFinancingReceivablesExcludingAccruedInterestPercent_019e3b80-301c-7406-882e-4471bbe9548f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableModificationToTotalFinancingReceivablesExcludingAccruedInterestPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3b80-301c-7f1d-abec-9a1e6c289d6f" xlink:to="loc_us-gaap_FinancingReceivableModificationToTotalFinancingReceivablesExcludingAccruedInterestPercent_019e3b80-301c-7406-882e-4471bbe9548f" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/InvestmentSecuritiesByMaturityDatesDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#InvestmentSecuritiesByMaturityDatesDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/InvestmentSecuritiesByMaturityDatesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3b80-301c-79a5-8477-e3784866da98" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e3b80-301c-72b8-9c8b-b3a5ebf2d564" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3b80-301c-79a5-8477-e3784866da98" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e3b80-301c-72b8-9c8b-b3a5ebf2d564" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e3b80-301c-7040-b074-e10341f2ab3b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e3b80-301c-72b8-9c8b-b3a5ebf2d564" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e3b80-301c-7040-b074-e10341f2ab3b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-7040-b074-e10341f2ab3b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e3b80-301c-7040-b074-e10341f2ab3b" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-7040-b074-e10341f2ab3b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-71ef-9405-656c99a300f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e3b80-301c-7040-b074-e10341f2ab3b" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-71ef-9405-656c99a300f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019e3b80-301c-7c96-956e-33a0f909b640" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-71ef-9405-656c99a300f8" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019e3b80-301c-7c96-956e-33a0f909b640" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesMember_019e3b80-301c-7426-9c51-128a0ed62804" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-71ef-9405-656c99a300f8" xlink:to="loc_us-gaap_MortgageBackedSecuritiesMember_019e3b80-301c-7426-9c51-128a0ed62804" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_019e3b80-301c-74df-8091-59131d7a0b64" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3b80-301c-79a5-8477-e3784866da98" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_019e3b80-301c-74df-8091-59131d7a0b64" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_019e3b80-301c-73dc-968a-08d869b82f66" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_019e3b80-301c-74df-8091-59131d7a0b64" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_019e3b80-301c-73dc-968a-08d869b82f66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_019e3b80-301c-7073-806d-fe04e6496f96" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_019e3b80-301c-74df-8091-59131d7a0b64" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_019e3b80-301c-7073-806d-fe04e6496f96" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_019e3b80-301c-7309-bc1b-8de39218a512" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_019e3b80-301c-74df-8091-59131d7a0b64" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_019e3b80-301c-7309-bc1b-8de39218a512" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost_019e3b80-301c-70b0-b470-ea948d38f714" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_019e3b80-301c-74df-8091-59131d7a0b64" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost_019e3b80-301c-70b0-b470-ea948d38f714" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_019e3b80-301c-7bc2-b51b-91bf06959414" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_019e3b80-301c-74df-8091-59131d7a0b64" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_019e3b80-301c-7bc2-b51b-91bf06959414" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_019e3b80-301c-7231-a045-64abf31a6e63" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3b80-301c-79a5-8477-e3784866da98" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_019e3b80-301c-7231-a045-64abf31a6e63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_019e3b80-301c-7109-9e03-70df6cab7e19" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_019e3b80-301c-7231-a045-64abf31a6e63" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_019e3b80-301c-7109-9e03-70df6cab7e19" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_019e3b80-301c-78ce-bdba-f7a090796a10" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_019e3b80-301c-7231-a045-64abf31a6e63" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_019e3b80-301c-78ce-bdba-f7a090796a10" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_019e3b80-301c-71da-8b2b-1ef65ee68ec9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_019e3b80-301c-7231-a045-64abf31a6e63" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_019e3b80-301c-71da-8b2b-1ef65ee68ec9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_019e3b80-301c-7472-bd3d-b32426bc2256" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_019e3b80-301c-7231-a045-64abf31a6e63" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_019e3b80-301c-7472-bd3d-b32426bc2256" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019e3b80-301c-7be1-bbf8-625c8588e346" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_019e3b80-301c-7231-a045-64abf31a6e63" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019e3b80-301c-7be1-bbf8-625c8588e346" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/InvestmentSecuritiesUnrealizedLossesDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#InvestmentSecuritiesUnrealizedLossesDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/InvestmentSecuritiesUnrealizedLossesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3b80-301c-76f3-a77b-3a7402422da8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e3b80-301c-765c-9f7e-c0305c4d7db2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3b80-301c-76f3-a77b-3a7402422da8" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e3b80-301c-765c-9f7e-c0305c4d7db2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e3b80-301c-7954-8903-04f4ff70ed4c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e3b80-301c-765c-9f7e-c0305c4d7db2" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e3b80-301c-7954-8903-04f4ff70ed4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-7954-8903-04f4ff70ed4c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e3b80-301c-7954-8903-04f4ff70ed4c" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-7954-8903-04f4ff70ed4c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-7334-a642-da051059945f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e3b80-301c-7954-8903-04f4ff70ed4c" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-7334-a642-da051059945f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasurySecuritiesMember_019e3b80-301c-7865-9f94-75899afcabc7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USTreasurySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-7334-a642-da051059945f" xlink:to="loc_us-gaap_USTreasurySecuritiesMember_019e3b80-301c-7865-9f94-75899afcabc7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MunicipalBondsMember_019e3b80-301c-734f-9f81-9f94c463dd1e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MunicipalBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-7334-a642-da051059945f" xlink:to="loc_us-gaap_MunicipalBondsMember_019e3b80-301c-734f-9f81-9f94c463dd1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019e3b80-301c-7bc6-91da-7e26c70ba866" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-7334-a642-da051059945f" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019e3b80-301c-7bc6-91da-7e26c70ba866" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesMember_019e3b80-301c-77a2-8a91-d47013798331" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-7334-a642-da051059945f" xlink:to="loc_us-gaap_MortgageBackedSecuritiesMember_019e3b80-301c-77a2-8a91-d47013798331" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract_019e3b80-301c-7aa7-b6df-c498ae313aa6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3b80-301c-76f3-a77b-3a7402422da8" xlink:to="loc_us-gaap_DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract_019e3b80-301c-7aa7-b6df-c498ae313aa6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_019e3b80-301c-79b9-8efa-3df372dacac4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract_019e3b80-301c-7aa7-b6df-c498ae313aa6" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_019e3b80-301c-79b9-8efa-3df372dacac4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_019e3b80-301c-7e76-a361-a8a23b5a0d11" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract_019e3b80-301c-7aa7-b6df-c498ae313aa6" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_019e3b80-301c-7e76-a361-a8a23b5a0d11" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_019e3b80-301c-77c4-89c6-05163d3379c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract_019e3b80-301c-7aa7-b6df-c498ae313aa6" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_019e3b80-301c-77c4-89c6-05163d3379c2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract_019e3b80-301c-7f83-8916-48c782a467e4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e3b80-301c-76f3-a77b-3a7402422da8" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract_019e3b80-301c-7f83-8916-48c782a467e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_019e3b80-301c-73d9-adff-8a5651b2370f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract_019e3b80-301c-7f83-8916-48c782a467e4" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_019e3b80-301c-73d9-adff-8a5651b2370f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_019e3b80-301c-7caa-97ff-0c308bc0c9ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract_019e3b80-301c-7f83-8916-48c782a467e4" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_019e3b80-301c-7caa-97ff-0c308bc0c9ea" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_019e3b80-301c-77b0-b658-8a0ea0e8ed33" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract_019e3b80-301c-7f83-8916-48c782a467e4" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_019e3b80-301c-77b0-b658-8a0ea0e8ed33" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/PortfolioLoansReceivableandAllowanceforCreditLossesClassificationofLoansDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#PortfolioLoansReceivableandAllowanceforCreditLossesClassificationofLoansDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/PortfolioLoansReceivableandAllowanceforCreditLossesClassificationofLoansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e3b80-301c-7350-8e93-4633f24788e3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e3b80-301c-7746-b1aa-05ca156224e4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e3b80-301c-7350-8e93-4633f24788e3" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e3b80-301c-7746-b1aa-05ca156224e4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-7116-86eb-f188dcd4987f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e3b80-301c-7746-b1aa-05ca156224e4" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-7116-86eb-f188dcd4987f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7116-86eb-f188dcd4987f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-7116-86eb-f188dcd4987f" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7116-86eb-f188dcd4987f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7481-845d-b5d4a49c03de" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-7116-86eb-f188dcd4987f" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7481-845d-b5d4a49c03de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateLoanMember_019e3b80-301c-7be9-9278-ec7f245f9961" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RealEstateLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7481-845d-b5d4a49c03de" xlink:to="loc_us-gaap_RealEstateLoanMember_019e3b80-301c-7be9-9278-ec7f245f9961" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditCardReceivablesMember_019e3b80-301c-7ab3-b420-45fde1a5b470" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditCardReceivablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7481-845d-b5d4a49c03de" xlink:to="loc_us-gaap_CreditCardReceivablesMember_019e3b80-301c-7ab3-b420-45fde1a5b470" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OtherConsumerMember_019e3b80-301c-7270-9963-ed54f92a674d" xlink:href="cbnk-20260630.xsd#cbnk_OtherConsumerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7481-845d-b5d4a49c03de" xlink:to="loc_cbnk_OtherConsumerMember_019e3b80-301c-7270-9963-ed54f92a674d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-7344-b932-1967459b4245" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e3b80-301c-7746-b1aa-05ca156224e4" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-7344-b932-1967459b4245" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7344-b932-1967459b4245_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-7344-b932-1967459b4245" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7344-b932-1967459b4245_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-787e-8d0f-218a48e27f30" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-7344-b932-1967459b4245" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-787e-8d0f-218a48e27f30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_019e3b80-301c-7d5d-b3d8-ca0880acec20" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-787e-8d0f-218a48e27f30" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_019e3b80-301c-7d5d-b3d8-ca0880acec20" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_019e3b80-301c-7eaa-baa0-ecf0191edb9f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-787e-8d0f-218a48e27f30" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_019e3b80-301c-7eaa-baa0-ecf0191edb9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_ConstructionPortfolioSegmentMember_019e3b80-301c-77fe-938a-eda7459e1c8b" xlink:href="cbnk-20260630.xsd#cbnk_ConstructionPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-787e-8d0f-218a48e27f30" xlink:to="loc_cbnk_ConstructionPortfolioSegmentMember_019e3b80-301c-77fe-938a-eda7459e1c8b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_CommercialAndIndustrialPortfolioSegmentMember_019e3b80-301c-7036-a778-a7a728f1a51b" xlink:href="cbnk-20260630.xsd#cbnk_CommercialAndIndustrialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-787e-8d0f-218a48e27f30" xlink:to="loc_cbnk_CommercialAndIndustrialPortfolioSegmentMember_019e3b80-301c-7036-a778-a7a728f1a51b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_019e3b80-301c-7cab-867a-f445f7a12c8f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-787e-8d0f-218a48e27f30" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_019e3b80-301c-7cab-867a-f445f7a12c8f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019e3b80-301c-7d73-94e3-a595d389109d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e3b80-301c-7350-8e93-4633f24788e3" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019e3b80-301c-7d73-94e3-a595d389109d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_FinancingReceivableAllowanceForCreditLossToOutstandingPercent_019e3b80-301c-7e02-906c-6ac65c931591" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_FinancingReceivableAllowanceForCreditLossToOutstandingPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e3b80-301c-7350-8e93-4633f24788e3" xlink:to="loc_srt_FinancingReceivableAllowanceForCreditLossToOutstandingPercent_019e3b80-301c-7e02-906c-6ac65c931591" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableDeferredIncome_019e3b80-301c-7c68-8a65-2492e7392084" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableDeferredIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e3b80-301c-7350-8e93-4633f24788e3" xlink:to="loc_us-gaap_FinancingReceivableDeferredIncome_019e3b80-301c-7c68-8a65-2492e7392084" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019e3b80-301c-7048-9b8e-48b2ea423f80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e3b80-301c-7350-8e93-4633f24788e3" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019e3b80-301c-7048-9b8e-48b2ea423f80" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019e3b80-301c-7fe8-8485-7e98aefed608" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e3b80-301c-7350-8e93-4633f24788e3" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019e3b80-301c-7fe8-8485-7e98aefed608" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/PortfolioLoansReceivableandAllowanceforCreditLossesAllowanceforLoanLossesDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#PortfolioLoansReceivableandAllowanceforCreditLossesAllowanceforLoanLossesDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/PortfolioLoansReceivableandAllowanceforCreditLossesAllowanceforLoanLossesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e3b80-301c-794f-b9e2-9d3e49154ec9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e3b80-301c-77e2-9dea-71afdb81922d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e3b80-301c-794f-b9e2-9d3e49154ec9" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e3b80-301c-77e2-9dea-71afdb81922d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-7fca-8b65-d7e5875a21f5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e3b80-301c-77e2-9dea-71afdb81922d" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-7fca-8b65-d7e5875a21f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7fca-8b65-d7e5875a21f5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-7fca-8b65-d7e5875a21f5" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7fca-8b65-d7e5875a21f5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7beb-8736-36f3eb0e07ca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-7fca-8b65-d7e5875a21f5" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7beb-8736-36f3eb0e07ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateLoanMember_019e3b80-301c-78c6-889b-919c34dc2a4b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RealEstateLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7beb-8736-36f3eb0e07ca" xlink:to="loc_us-gaap_RealEstateLoanMember_019e3b80-301c-78c6-889b-919c34dc2a4b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditCardReceivablesMember_019e3b80-301c-7a57-ba25-b0931962c2b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditCardReceivablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7beb-8736-36f3eb0e07ca" xlink:to="loc_us-gaap_CreditCardReceivablesMember_019e3b80-301c-7a57-ba25-b0931962c2b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OtherConsumerMember_019e3b80-301c-7b03-adbe-2bcbc992e9f4" xlink:href="cbnk-20260630.xsd#cbnk_OtherConsumerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7beb-8736-36f3eb0e07ca" xlink:to="loc_cbnk_OtherConsumerMember_019e3b80-301c-7b03-adbe-2bcbc992e9f4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-7a04-8d92-7f20eb011d7e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e3b80-301c-77e2-9dea-71afdb81922d" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-7a04-8d92-7f20eb011d7e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7a04-8d92-7f20eb011d7e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-7a04-8d92-7f20eb011d7e" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7a04-8d92-7f20eb011d7e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7060-88bc-4f1de525c087" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-7a04-8d92-7f20eb011d7e" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7060-88bc-4f1de525c087" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_019e3b80-301c-70f2-9d27-f41653bc5e66" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7060-88bc-4f1de525c087" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_019e3b80-301c-70f2-9d27-f41653bc5e66" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_019e3b80-301c-7586-9cc0-175f148e7ade" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7060-88bc-4f1de525c087" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_019e3b80-301c-7586-9cc0-175f148e7ade" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_ConstructionPortfolioSegmentMember_019e3b80-301c-765d-8e2d-bf9cf1440e5e" xlink:href="cbnk-20260630.xsd#cbnk_ConstructionPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7060-88bc-4f1de525c087" xlink:to="loc_cbnk_ConstructionPortfolioSegmentMember_019e3b80-301c-765d-8e2d-bf9cf1440e5e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_CommercialAndIndustrialPortfolioSegmentMember_019e3b80-301c-7f62-bd2e-40c4dea636d1" xlink:href="cbnk-20260630.xsd#cbnk_CommercialAndIndustrialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7060-88bc-4f1de525c087" xlink:to="loc_cbnk_CommercialAndIndustrialPortfolioSegmentMember_019e3b80-301c-7f62-bd2e-40c4dea636d1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_019e3b80-301c-7781-ac05-6a6838ef2403" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7060-88bc-4f1de525c087" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_019e3b80-301c-7781-ac05-6a6838ef2403" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRollForward_019e3b80-301c-724f-94f4-9f287467b39b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e3b80-301c-794f-b9e2-9d3e49154ec9" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRollForward_019e3b80-301c-724f-94f4-9f287467b39b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019e3b80-301c-7fbc-b0a3-744e0dff2462" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRollForward_019e3b80-301c-724f-94f4-9f287467b39b" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019e3b80-301c-7fbc-b0a3-744e0dff2462" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal_019e3b80-301c-7f23-9f8b-4759f705fec1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRollForward_019e3b80-301c-724f-94f4-9f287467b39b" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal_019e3b80-301c-7f23-9f8b-4759f705fec1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019e3b80-301c-7a5b-97cf-e8bcbb6892d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRollForward_019e3b80-301c-724f-94f4-9f287467b39b" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019e3b80-301c-7a5b-97cf-e8bcbb6892d1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery_019e3b80-301c-7c2b-9a5b-bbdc65be0bb4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRollForward_019e3b80-301c-724f-94f4-9f287467b39b" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery_019e3b80-301c-7c2b-9a5b-bbdc65be0bb4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019e3b80-301c-7633-8be5-5541f010a5e5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/PortfolioLoansReceivableandAllowanceforCreditLossesPastDueFinancingReceivableDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#PortfolioLoansReceivableandAllowanceforCreditLossesPastDueFinancingReceivableDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/PortfolioLoansReceivableandAllowanceforCreditLossesPastDueFinancingReceivableDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_019e3b80-301c-7d0e-b9c7-4b6ad871ddb6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_019e3b80-301c-7249-8e08-1cb9e14bfe89" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFinancingReceivablesPastDueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_019e3b80-301c-7d0e-b9c7-4b6ad871ddb6" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_019e3b80-301c-7249-8e08-1cb9e14bfe89" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-7041-b4b4-f2ab3bd15148" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_019e3b80-301c-7249-8e08-1cb9e14bfe89" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-7041-b4b4-f2ab3bd15148" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7041-b4b4-f2ab3bd15148_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-7041-b4b4-f2ab3bd15148" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7041-b4b4-f2ab3bd15148_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7cf4-87d9-4bbd737d0d13" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-7041-b4b4-f2ab3bd15148" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7cf4-87d9-4bbd737d0d13" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateLoanMember_019e3b80-301c-7cf2-9e03-dc8e87f6bd80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RealEstateLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7cf4-87d9-4bbd737d0d13" xlink:to="loc_us-gaap_RealEstateLoanMember_019e3b80-301c-7cf2-9e03-dc8e87f6bd80" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditCardReceivablesMember_019e3b80-301c-7c0c-bd7e-b355abe830e5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditCardReceivablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7cf4-87d9-4bbd737d0d13" xlink:to="loc_us-gaap_CreditCardReceivablesMember_019e3b80-301c-7c0c-bd7e-b355abe830e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OtherConsumerMember_019e3b80-301c-7bb4-ad72-afb5bdcd8d39" xlink:href="cbnk-20260630.xsd#cbnk_OtherConsumerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7cf4-87d9-4bbd737d0d13" xlink:to="loc_cbnk_OtherConsumerMember_019e3b80-301c-7bb4-ad72-afb5bdcd8d39" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-7e6e-a11b-c815e1eb2c20" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_019e3b80-301c-7249-8e08-1cb9e14bfe89" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-7e6e-a11b-c815e1eb2c20" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7e6e-a11b-c815e1eb2c20_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-7e6e-a11b-c815e1eb2c20" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7e6e-a11b-c815e1eb2c20_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7e7b-9674-55dcb6eca909" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-7e6e-a11b-c815e1eb2c20" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7e7b-9674-55dcb6eca909" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_019e3b80-301c-768a-9b09-621cc0de590d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7e7b-9674-55dcb6eca909" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_019e3b80-301c-768a-9b09-621cc0de590d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_019e3b80-301c-763d-95a9-3f27f556fc7d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7e7b-9674-55dcb6eca909" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_019e3b80-301c-763d-95a9-3f27f556fc7d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_ConstructionPortfolioSegmentMember_019e3b80-301c-7d6d-849c-a8130bf6a5c9" xlink:href="cbnk-20260630.xsd#cbnk_ConstructionPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7e7b-9674-55dcb6eca909" xlink:to="loc_cbnk_ConstructionPortfolioSegmentMember_019e3b80-301c-7d6d-849c-a8130bf6a5c9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_CommercialAndIndustrialPortfolioSegmentMember_019e3b80-301c-7def-a826-9bc26acfa0ba" xlink:href="cbnk-20260630.xsd#cbnk_CommercialAndIndustrialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7e7b-9674-55dcb6eca909" xlink:to="loc_cbnk_CommercialAndIndustrialPortfolioSegmentMember_019e3b80-301c-7def-a826-9bc26acfa0ba" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_019e3b80-301c-7945-840d-7db30bbe8d4d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7e7b-9674-55dcb6eca909" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_019e3b80-301c-7945-840d-7db30bbe8d4d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019e3b80-301c-7bfa-bed2-f7be55912eff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablesPeriodPastDueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_019e3b80-301c-7249-8e08-1cb9e14bfe89" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019e3b80-301c-7bfa-bed2-f7be55912eff" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019e3b80-301c-7bfa-bed2-f7be55912eff_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019e3b80-301c-7bfa-bed2-f7be55912eff" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019e3b80-301c-7bfa-bed2-f7be55912eff_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019e3b80-301c-737e-8edc-02f5634507d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019e3b80-301c-7bfa-bed2-f7be55912eff" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019e3b80-301c-737e-8edc-02f5634507d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialAssetPastDueMember_019e3b80-301c-7858-8087-248af08ab25d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialAssetPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019e3b80-301c-737e-8edc-02f5634507d4" xlink:to="loc_us-gaap_FinancialAssetPastDueMember_019e3b80-301c-7858-8087-248af08ab25d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivables30To59DaysPastDueMember_019e3b80-301c-7cdf-93c4-f860946223dd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivables30To59DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialAssetPastDueMember_019e3b80-301c-7858-8087-248af08ab25d" xlink:to="loc_us-gaap_FinancingReceivables30To59DaysPastDueMember_019e3b80-301c-7cdf-93c4-f860946223dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivables60To89DaysPastDueMember_019e3b80-301c-72a7-ae0d-040cad00c539" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivables60To89DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialAssetPastDueMember_019e3b80-301c-7858-8087-248af08ab25d" xlink:to="loc_us-gaap_FinancingReceivables60To89DaysPastDueMember_019e3b80-301c-72a7-ae0d-040cad00c539" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_019e3b80-301c-7953-8d7d-501d8e67adbc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialAssetPastDueMember_019e3b80-301c-7858-8087-248af08ab25d" xlink:to="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_019e3b80-301c-7953-8d7d-501d8e67adbc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialAssetNotPastDueMember_019e3b80-301c-74c2-a080-10708a251a77" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialAssetNotPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019e3b80-301c-737e-8edc-02f5634507d4" xlink:to="loc_us-gaap_FinancialAssetNotPastDueMember_019e3b80-301c-74c2-a080-10708a251a77" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019e3b80-301c-7634-963d-3897302fb36c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_019e3b80-301c-7d0e-b9c7-4b6ad871ddb6" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019e3b80-301c-7634-963d-3897302fb36c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterest90DaysOrMorePastDueStillAccruing_019e3b80-301c-7b95-b30f-9a0ac9f63a53" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterest90DaysOrMorePastDueStillAccruing"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_019e3b80-301c-7d0e-b9c7-4b6ad871ddb6" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterest90DaysOrMorePastDueStillAccruing_019e3b80-301c-7b95-b30f-9a0ac9f63a53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual_019e3b80-301c-7ce3-b1ed-78482eed78d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_019e3b80-301c-7d0e-b9c7-4b6ad871ddb6" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual_019e3b80-301c-7ce3-b1ed-78482eed78d0" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/PortfolioLoansReceivableandAllowanceforCreditLossesNarrativeDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#PortfolioLoansReceivableandAllowanceforCreditLossesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/PortfolioLoansReceivableandAllowanceforCreditLossesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e3b80-301c-7e21-88b1-ee65fbc87634" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e3b80-301c-7a03-ae89-b1ca104128ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e3b80-301c-7e21-88b1-ee65fbc87634" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e3b80-301c-7a03-ae89-b1ca104128ea" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralAxis_019e3b80-301c-70b8-b25d-70d33a39d4d6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e3b80-301c-7a03-ae89-b1ca104128ea" xlink:to="loc_us-gaap_CollateralAxis_019e3b80-301c-70b8-b25d-70d33a39d4d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralDomain_019e3b80-301c-70b8-b25d-70d33a39d4d6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CollateralAxis_019e3b80-301c-70b8-b25d-70d33a39d4d6" xlink:to="loc_us-gaap_CollateralDomain_019e3b80-301c-70b8-b25d-70d33a39d4d6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralDomain_019e3b80-301c-7be0-a349-5711c8fc0c95" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CollateralAxis_019e3b80-301c-70b8-b25d-70d33a39d4d6" xlink:to="loc_us-gaap_CollateralDomain_019e3b80-301c-7be0-a349-5711c8fc0c95" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialRealEstateMember_019e3b80-301c-7036-9359-bbff850aed51" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CollateralDomain_019e3b80-301c-7be0-a349-5711c8fc0c95" xlink:to="loc_us-gaap_ResidentialRealEstateMember_019e3b80-301c-7036-9359-bbff850aed51" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-74fa-bd32-cd2abc3b0a42" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e3b80-301c-7a03-ae89-b1ca104128ea" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-74fa-bd32-cd2abc3b0a42" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-74fa-bd32-cd2abc3b0a42_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-74fa-bd32-cd2abc3b0a42" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-74fa-bd32-cd2abc3b0a42_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7e28-8cfc-342fac30a5fc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-74fa-bd32-cd2abc3b0a42" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7e28-8cfc-342fac30a5fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateLoanMember_019e3b80-301c-7959-83d9-6b8b0518051d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RealEstateLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7e28-8cfc-342fac30a5fc" xlink:to="loc_us-gaap_RealEstateLoanMember_019e3b80-301c-7959-83d9-6b8b0518051d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-7b63-904c-439d3179746f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e3b80-301c-7a03-ae89-b1ca104128ea" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-7b63-904c-439d3179746f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7b63-904c-439d3179746f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-7b63-904c-439d3179746f" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7b63-904c-439d3179746f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7cf7-af9e-42ac5dae38ba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-7b63-904c-439d3179746f" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7cf7-af9e-42ac5dae38ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_019e3b80-301c-73de-9266-1e9e1777853d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7cf7-af9e-42ac5dae38ba" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_019e3b80-301c-73de-9266-1e9e1777853d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_019e3b80-301c-7a7c-95d8-5033b8e86688" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7cf7-af9e-42ac5dae38ba" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_019e3b80-301c-7a7c-95d8-5033b8e86688" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_ConstructionPortfolioSegmentMember_019fa1c7-87db-73c1-a4b1-6cf215f65cf0" xlink:href="cbnk-20260630.xsd#cbnk_ConstructionPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7cf7-af9e-42ac5dae38ba" xlink:to="loc_cbnk_ConstructionPortfolioSegmentMember_019fa1c7-87db-73c1-a4b1-6cf215f65cf0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_CommercialAndIndustrialPortfolioSegmentMember_019e3b80-301c-7ad2-80eb-ff9532922cda" xlink:href="cbnk-20260630.xsd#cbnk_CommercialAndIndustrialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7cf7-af9e-42ac5dae38ba" xlink:to="loc_cbnk_CommercialAndIndustrialPortfolioSegmentMember_019e3b80-301c-7ad2-80eb-ff9532922cda" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019e3b80-301c-77b6-882b-59fe366d01c3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e3b80-301c-7e21-88b1-ee65fbc87634" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019e3b80-301c-77b6-882b-59fe366d01c3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_FinancingReceivableExcludingAccruedInterestModifiedAccumulatedRelatedAllowance_019e3b80-301c-768c-96fc-f25c0dfcc0f3" xlink:href="cbnk-20260630.xsd#cbnk_FinancingReceivableExcludingAccruedInterestModifiedAccumulatedRelatedAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e3b80-301c-7e21-88b1-ee65fbc87634" xlink:to="loc_cbnk_FinancingReceivableExcludingAccruedInterestModifiedAccumulatedRelatedAllowance_019e3b80-301c-768c-96fc-f25c0dfcc0f3" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/PortfolioLoansReceivableandAllowanceforCreditLossesScheduleofNonaccrualLoansDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#PortfolioLoansReceivableandAllowanceforCreditLossesScheduleofNonaccrualLoansDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/PortfolioLoansReceivableandAllowanceforCreditLossesScheduleofNonaccrualLoansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_019e3b80-301c-7a94-9e62-f029bd4791af" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_019e3b80-301c-7c47-baa8-7e3cd02028bb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFinancingReceivablesPastDueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_019e3b80-301c-7a94-9e62-f029bd4791af" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_019e3b80-301c-7c47-baa8-7e3cd02028bb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-7129-ba6e-dfaa434f665d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_019e3b80-301c-7c47-baa8-7e3cd02028bb" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-7129-ba6e-dfaa434f665d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7129-ba6e-dfaa434f665d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-7129-ba6e-dfaa434f665d" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7129-ba6e-dfaa434f665d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7486-a576-ed4f03f0b3eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-7129-ba6e-dfaa434f665d" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7486-a576-ed4f03f0b3eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateLoanMember_019e3b80-301c-725f-9932-b9b76c03f3cb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RealEstateLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7486-a576-ed4f03f0b3eb" xlink:to="loc_us-gaap_RealEstateLoanMember_019e3b80-301c-725f-9932-b9b76c03f3cb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-740a-85d8-6e8e2506136e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_019e3b80-301c-7c47-baa8-7e3cd02028bb" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-740a-85d8-6e8e2506136e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-740a-85d8-6e8e2506136e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-740a-85d8-6e8e2506136e" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-740a-85d8-6e8e2506136e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-70e5-8399-a969bf3605ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-740a-85d8-6e8e2506136e" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-70e5-8399-a969bf3605ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_019e3b80-301c-7657-a05b-bff10644b77e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-70e5-8399-a969bf3605ec" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_019e3b80-301c-7657-a05b-bff10644b77e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_019e3b80-301c-75a7-914d-438a16d8a8de" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-70e5-8399-a969bf3605ec" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_019e3b80-301c-75a7-914d-438a16d8a8de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_ConstructionPortfolioSegmentMember_019e3b80-301c-7d62-a71b-130e9386f45e" xlink:href="cbnk-20260630.xsd#cbnk_ConstructionPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-70e5-8399-a969bf3605ec" xlink:to="loc_cbnk_ConstructionPortfolioSegmentMember_019e3b80-301c-7d62-a71b-130e9386f45e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_CommercialAndIndustrialPortfolioSegmentMember_019e3b80-301c-7f10-b31f-0d1ac2b8495f" xlink:href="cbnk-20260630.xsd#cbnk_CommercialAndIndustrialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-70e5-8399-a969bf3605ec" xlink:to="loc_cbnk_CommercialAndIndustrialPortfolioSegmentMember_019e3b80-301c-7f10-b31f-0d1ac2b8495f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrualNoAllowance_019e3b80-301c-7176-901f-c7890aeef21c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrualNoAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_019e3b80-301c-7a94-9e62-f029bd4791af" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrualNoAllowance_019e3b80-301c-7176-901f-c7890aeef21c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_FinancingReceivableExcludingAccruedInterestNonaccrualWithAllowanceForCreditLosses_019e3b80-301c-740a-8a89-66202b9e4c99" xlink:href="cbnk-20260630.xsd#cbnk_FinancingReceivableExcludingAccruedInterestNonaccrualWithAllowanceForCreditLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_019e3b80-301c-7a94-9e62-f029bd4791af" xlink:to="loc_cbnk_FinancingReceivableExcludingAccruedInterestNonaccrualWithAllowanceForCreditLosses_019e3b80-301c-740a-8a89-66202b9e4c99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual_019e3b80-301c-7d2c-9d75-76c1f3d79819" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_019e3b80-301c-7a94-9e62-f029bd4791af" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual_019e3b80-301c-7d2c-9d75-76c1f3d79819" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestModifiedAccumulated_019e3b80-301c-72fb-b07f-c4185ef9c31c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestModifiedAccumulated"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_019e3b80-301c-7a94-9e62-f029bd4791af" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestModifiedAccumulated_019e3b80-301c-72fb-b07f-c4185ef9c31c" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/PortfolioLoansReceivableandAllowanceforCreditLossesScheduleofLoanModificationstoBorrowersExperiencingFinancialDifficultyDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#PortfolioLoansReceivableandAllowanceforCreditLossesScheduleofLoanModificationstoBorrowersExperiencingFinancialDifficultyDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/PortfolioLoansReceivableandAllowanceforCreditLossesScheduleofLoanModificationstoBorrowersExperiencingFinancialDifficultyDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableModificationsLineItems_019e3b80-301c-7af8-89a2-fadd8690c902" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableModificationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_019e3b80-301c-73cb-935d-9e2d1b339388" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_019e3b80-301c-7af8-89a2-fadd8690c902" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_019e3b80-301c-73cb-935d-9e2d1b339388" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-73fe-8a52-0c2f7d62ce43" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_019e3b80-301c-73cb-935d-9e2d1b339388" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-73fe-8a52-0c2f7d62ce43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-73fe-8a52-0c2f7d62ce43_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-73fe-8a52-0c2f7d62ce43" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-73fe-8a52-0c2f7d62ce43_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7897-a1b6-ff4fdebd47da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-73fe-8a52-0c2f7d62ce43" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7897-a1b6-ff4fdebd47da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateLoanMember_019e3b80-301c-7e4e-ad63-a71bf69b3909" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RealEstateLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7897-a1b6-ff4fdebd47da" xlink:to="loc_us-gaap_RealEstateLoanMember_019e3b80-301c-7e4e-ad63-a71bf69b3909" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-74e0-80fe-f61b126d0f08" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_019e3b80-301c-73cb-935d-9e2d1b339388" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-74e0-80fe-f61b126d0f08" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-74e0-80fe-f61b126d0f08_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-74e0-80fe-f61b126d0f08" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-74e0-80fe-f61b126d0f08_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-705a-8e35-f19bf14160a4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-74e0-80fe-f61b126d0f08" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-705a-8e35-f19bf14160a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_019e3b80-301c-7380-b399-c8b23a6a9e14" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-705a-8e35-f19bf14160a4" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_019e3b80-301c-7380-b399-c8b23a6a9e14" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_CommercialAndIndustrialPortfolioSegmentMember_019e3b80-301c-7134-8be1-9ef5a0de3883" xlink:href="cbnk-20260630.xsd#cbnk_CommercialAndIndustrialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-705a-8e35-f19bf14160a4" xlink:to="loc_cbnk_CommercialAndIndustrialPortfolioSegmentMember_019e3b80-301c-7134-8be1-9ef5a0de3883" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanRestructuringModificationAxis_019e3b80-301c-7222-a844-38437bf989f0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoanRestructuringModificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_019e3b80-301c-73cb-935d-9e2d1b339388" xlink:to="loc_us-gaap_LoanRestructuringModificationAxis_019e3b80-301c-7222-a844-38437bf989f0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanRestructuringModificationDomain_019e3b80-301c-7222-a844-38437bf989f0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoanRestructuringModificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LoanRestructuringModificationAxis_019e3b80-301c-7222-a844-38437bf989f0" xlink:to="loc_us-gaap_LoanRestructuringModificationDomain_019e3b80-301c-7222-a844-38437bf989f0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanRestructuringModificationDomain_019e3b80-301c-7ac2-91b5-5eff4e8f83f1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoanRestructuringModificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LoanRestructuringModificationAxis_019e3b80-301c-7222-a844-38437bf989f0" xlink:to="loc_us-gaap_LoanRestructuringModificationDomain_019e3b80-301c-7ac2-91b5-5eff4e8f83f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualInterestRateReductionMember_019fb2d5-44ae-7b1f-88c7-c6e9ecb31eb9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractualInterestRateReductionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationDomain_019e3b80-301c-7ac2-91b5-5eff4e8f83f1" xlink:to="loc_us-gaap_ContractualInterestRateReductionMember_019fb2d5-44ae-7b1f-88c7-c6e9ecb31eb9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentDeferralMember_019e3b80-301c-77e2-95ae-a885a0ebc559" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentDeferralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationDomain_019e3b80-301c-7ac2-91b5-5eff4e8f83f1" xlink:to="loc_us-gaap_PaymentDeferralMember_019e3b80-301c-77e2-95ae-a885a0ebc559" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_ExtendedMaturityAndPaymentDeferralMember_019e3b80-301c-71e6-9b4c-1629661a1446" xlink:href="cbnk-20260630.xsd#cbnk_ExtendedMaturityAndPaymentDeferralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationDomain_019e3b80-301c-7ac2-91b5-5eff4e8f83f1" xlink:to="loc_cbnk_ExtendedMaturityAndPaymentDeferralMember_019e3b80-301c-71e6-9b4c-1629661a1446" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_InterestRateReductionAndPaymentDeferralMember_019fb2e0-62a8-7b17-9aff-b3bd2916321d" xlink:href="cbnk-20260630.xsd#cbnk_InterestRateReductionAndPaymentDeferralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationDomain_019e3b80-301c-7ac2-91b5-5eff4e8f83f1" xlink:to="loc_cbnk_InterestRateReductionAndPaymentDeferralMember_019fb2e0-62a8-7b17-9aff-b3bd2916321d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ExtendedMaturityMember_019fb2e1-c60c-7ca9-afdd-33d2653224c6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ExtendedMaturityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationDomain_019e3b80-301c-7ac2-91b5-5eff4e8f83f1" xlink:to="loc_us-gaap_ExtendedMaturityMember_019fb2e1-c60c-7ca9-afdd-33d2653224c6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanRestructuringModificationNameAxis_019e3b80-301c-7742-b535-118511bdde5b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoanRestructuringModificationNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_019e3b80-301c-73cb-935d-9e2d1b339388" xlink:to="loc_us-gaap_LoanRestructuringModificationNameAxis_019e3b80-301c-7742-b535-118511bdde5b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanRestructuringModificationNameDomain_019e3b80-301c-7742-b535-118511bdde5b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoanRestructuringModificationNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LoanRestructuringModificationNameAxis_019e3b80-301c-7742-b535-118511bdde5b" xlink:to="loc_us-gaap_LoanRestructuringModificationNameDomain_019e3b80-301c-7742-b535-118511bdde5b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanRestructuringModificationNameDomain_019e3b80-301c-746d-8169-4bb51f3c2010" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoanRestructuringModificationNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LoanRestructuringModificationNameAxis_019e3b80-301c-7742-b535-118511bdde5b" xlink:to="loc_us-gaap_LoanRestructuringModificationNameDomain_019e3b80-301c-746d-8169-4bb51f3c2010" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_LoanModificationOneMember_019e3b80-301c-7e1c-849f-249e9cfe9c30" xlink:href="cbnk-20260630.xsd#cbnk_LoanModificationOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationNameDomain_019e3b80-301c-746d-8169-4bb51f3c2010" xlink:to="loc_cbnk_LoanModificationOneMember_019e3b80-301c-7e1c-849f-249e9cfe9c30" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_LoanModificationTwoMember_019e3b80-301c-768a-82d1-9b173026abb8" xlink:href="cbnk-20260630.xsd#cbnk_LoanModificationTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationNameDomain_019e3b80-301c-746d-8169-4bb51f3c2010" xlink:to="loc_cbnk_LoanModificationTwoMember_019e3b80-301c-768a-82d1-9b173026abb8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_LoanModificationThreeMember_019e3b80-301c-7e73-bf7c-69aeb1bdf6c9" xlink:href="cbnk-20260630.xsd#cbnk_LoanModificationThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationNameDomain_019e3b80-301c-746d-8169-4bb51f3c2010" xlink:to="loc_cbnk_LoanModificationThreeMember_019e3b80-301c-7e73-bf7c-69aeb1bdf6c9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_LoanModificationFourMember_019e3b80-301c-7f02-a46a-8f71e6f33636" xlink:href="cbnk-20260630.xsd#cbnk_LoanModificationFourMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationNameDomain_019e3b80-301c-746d-8169-4bb51f3c2010" xlink:to="loc_cbnk_LoanModificationFourMember_019e3b80-301c-7f02-a46a-8f71e6f33636" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_LoanModificationFiveMember_019e3b80-301c-78f3-bbbe-82685da763b3" xlink:href="cbnk-20260630.xsd#cbnk_LoanModificationFiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationNameDomain_019e3b80-301c-746d-8169-4bb51f3c2010" xlink:to="loc_cbnk_LoanModificationFiveMember_019e3b80-301c-78f3-bbbe-82685da763b3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_LoanModificationSixMember_019e3b80-301c-7a13-96ad-7867f55bc2bf" xlink:href="cbnk-20260630.xsd#cbnk_LoanModificationSixMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationNameDomain_019e3b80-301c-746d-8169-4bb51f3c2010" xlink:to="loc_cbnk_LoanModificationSixMember_019e3b80-301c-7a13-96ad-7867f55bc2bf" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_FinancingReceivableExcludingAccruedInterestModifiedInPeriodNumberOfContracts_019e3b80-301c-7fc4-8d0f-5b71b7c7b78b" xlink:href="cbnk-20260630.xsd#cbnk_FinancingReceivableExcludingAccruedInterestModifiedInPeriodNumberOfContracts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_019e3b80-301c-7af8-89a2-fadd8690c902" xlink:to="loc_cbnk_FinancingReceivableExcludingAccruedInterestModifiedInPeriodNumberOfContracts_019e3b80-301c-7fc4-8d0f-5b71b7c7b78b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPeriod_019e3b80-301c-716b-bf9f-5cd143704539" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_019e3b80-301c-7af8-89a2-fadd8690c902" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPeriod_019e3b80-301c-716b-bf9f-5cd143704539" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableModificationToTotalFinancingReceivablesExcludingAccruedInterestPercent_019e3b80-301c-71ea-9664-83a4589ad18c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableModificationToTotalFinancingReceivablesExcludingAccruedInterestPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_019e3b80-301c-7af8-89a2-fadd8690c902" xlink:to="loc_us-gaap_FinancingReceivableModificationToTotalFinancingReceivablesExcludingAccruedInterestPercent_019e3b80-301c-71ea-9664-83a4589ad18c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableModifiedWeightedAverageInterestRateBeforeModification_019fa47c-913f-7b7f-be18-2b79f31a2580" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableModifiedWeightedAverageInterestRateBeforeModification"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_019e3b80-301c-7af8-89a2-fadd8690c902" xlink:to="loc_us-gaap_FinancingReceivableModifiedWeightedAverageInterestRateBeforeModification_019fa47c-913f-7b7f-be18-2b79f31a2580" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableModifiedWeightedAverageInterestRateAfterModification_019e3b80-301c-714e-a475-9b50ead6f28f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableModifiedWeightedAverageInterestRateAfterModification"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_019e3b80-301c-7af8-89a2-fadd8690c902" xlink:to="loc_us-gaap_FinancingReceivableModifiedWeightedAverageInterestRateAfterModification_019e3b80-301c-714e-a475-9b50ead6f28f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification_019e3b80-301c-78f6-a08b-df7f6a160795" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_019e3b80-301c-7af8-89a2-fadd8690c902" xlink:to="loc_us-gaap_FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification_019e3b80-301c-78f6-a08b-df7f6a160795" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableModifiedPaymentDeferralPeriod_019e3b80-301c-7a94-87d1-490cc26bbc59" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableModifiedPaymentDeferralPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_019e3b80-301c-7af8-89a2-fadd8690c902" xlink:to="loc_us-gaap_FinancingReceivableModifiedPaymentDeferralPeriod_019e3b80-301c-7a94-87d1-490cc26bbc59" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/PortfolioLoansReceivableandAllowanceforCreditLossesScheduleofLoanModificationsPastDueDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#PortfolioLoansReceivableandAllowanceforCreditLossesScheduleofLoanModificationsPastDueDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/PortfolioLoansReceivableandAllowanceforCreditLossesScheduleofLoanModificationsPastDueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_019e3b80-301c-72f5-9b1c-2cd5c2dd27bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_019e3b80-301c-75c5-9391-f73621af224b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFinancingReceivablesPastDueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_019e3b80-301c-72f5-9b1c-2cd5c2dd27bd" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_019e3b80-301c-75c5-9391-f73621af224b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-79c6-82e1-37446da0d250" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_019e3b80-301c-75c5-9391-f73621af224b" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-79c6-82e1-37446da0d250" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-79c6-82e1-37446da0d250_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-79c6-82e1-37446da0d250" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-79c6-82e1-37446da0d250_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-762b-80df-5309ecb39c7b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-79c6-82e1-37446da0d250" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-762b-80df-5309ecb39c7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateLoanMember_019e3b80-301c-78ac-861a-33af3efbc23f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RealEstateLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-762b-80df-5309ecb39c7b" xlink:to="loc_us-gaap_RealEstateLoanMember_019e3b80-301c-78ac-861a-33af3efbc23f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-7861-a8c6-69f98c7be8ac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_019e3b80-301c-75c5-9391-f73621af224b" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-7861-a8c6-69f98c7be8ac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7861-a8c6-69f98c7be8ac_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-7861-a8c6-69f98c7be8ac" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7861-a8c6-69f98c7be8ac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7106-a86d-91a3ac2f54b7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-7861-a8c6-69f98c7be8ac" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7106-a86d-91a3ac2f54b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_019e3b80-301c-7548-8ff8-1f145d3a7fcb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7106-a86d-91a3ac2f54b7" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_019e3b80-301c-7548-8ff8-1f145d3a7fcb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_CommercialAndIndustrialPortfolioSegmentMember_019e3b80-301c-7373-a684-04ed7b13ccab" xlink:href="cbnk-20260630.xsd#cbnk_CommercialAndIndustrialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7106-a86d-91a3ac2f54b7" xlink:to="loc_cbnk_CommercialAndIndustrialPortfolioSegmentMember_019e3b80-301c-7373-a684-04ed7b13ccab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019e3b80-301c-73fd-a263-d8b878ec63b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablesPeriodPastDueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_019e3b80-301c-75c5-9391-f73621af224b" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019e3b80-301c-73fd-a263-d8b878ec63b3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019e3b80-301c-73fd-a263-d8b878ec63b3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019e3b80-301c-73fd-a263-d8b878ec63b3" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019e3b80-301c-73fd-a263-d8b878ec63b3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019e3b80-301c-7668-ac49-8d2b1c3e1264" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019e3b80-301c-73fd-a263-d8b878ec63b3" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019e3b80-301c-7668-ac49-8d2b1c3e1264" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialAssetNotPastDueMember_019e3b80-301c-798f-8f14-1b5dc44b1157" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialAssetNotPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019e3b80-301c-7668-ac49-8d2b1c3e1264" xlink:to="loc_us-gaap_FinancialAssetNotPastDueMember_019e3b80-301c-798f-8f14-1b5dc44b1157" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_FinancialAsset30To89DaysPastDueMember_019e3b80-301c-7628-9386-588450901580" xlink:href="cbnk-20260630.xsd#cbnk_FinancialAsset30To89DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019e3b80-301c-7668-ac49-8d2b1c3e1264" xlink:to="loc_cbnk_FinancialAsset30To89DaysPastDueMember_019e3b80-301c-7628-9386-588450901580" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_019e3b80-301c-74f7-bcee-4cc07fa353d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019e3b80-301c-7668-ac49-8d2b1c3e1264" xlink:to="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_019e3b80-301c-74f7-bcee-4cc07fa353d1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPast12Months_019e3b80-301c-7925-a742-e1becfc5c602" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPast12Months"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_019e3b80-301c-72f5-9b1c-2cd5c2dd27bd" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPast12Months_019e3b80-301c-7925-a742-e1becfc5c602" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_FinancingReceivableExcludingAccruedInterestModifiedAfter12MonthsNonaccrual_019e3b80-301c-75f8-b3e3-cfac8433cd99" xlink:href="cbnk-20260630.xsd#cbnk_FinancingReceivableExcludingAccruedInterestModifiedAfter12MonthsNonaccrual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_019e3b80-301c-72f5-9b1c-2cd5c2dd27bd" xlink:to="loc_cbnk_FinancingReceivableExcludingAccruedInterestModifiedAfter12MonthsNonaccrual_019e3b80-301c-75f8-b3e3-cfac8433cd99" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/PortfolioLoansReceivableandAllowanceforCreditLossesCreditQualityIndicatorsDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#PortfolioLoansReceivableandAllowanceforCreditLossesCreditQualityIndicatorsDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/PortfolioLoansReceivableandAllowanceforCreditLossesCreditQualityIndicatorsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019e3b80-301c-71f3-9ad4-2b4470ac8531" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_019e3b80-301c-7ccb-a388-8c486a82dfd6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019e3b80-301c-71f3-9ad4-2b4470ac8531" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_019e3b80-301c-7ccb-a388-8c486a82dfd6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-755e-9c2a-7f5c7dad7ab7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_019e3b80-301c-7ccb-a388-8c486a82dfd6" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-755e-9c2a-7f5c7dad7ab7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-755e-9c2a-7f5c7dad7ab7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-755e-9c2a-7f5c7dad7ab7" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-755e-9c2a-7f5c7dad7ab7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7707-85fb-c4dc1300b161" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-755e-9c2a-7f5c7dad7ab7" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7707-85fb-c4dc1300b161" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateLoanMember_019e3b80-301c-738b-a635-eebb5677e456" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RealEstateLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7707-85fb-c4dc1300b161" xlink:to="loc_us-gaap_RealEstateLoanMember_019e3b80-301c-738b-a635-eebb5677e456" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OtherConsumerMember_019e3b80-301c-72f3-8241-2289cd7b17c6" xlink:href="cbnk-20260630.xsd#cbnk_OtherConsumerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7707-85fb-c4dc1300b161" xlink:to="loc_cbnk_OtherConsumerMember_019e3b80-301c-72f3-8241-2289cd7b17c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditCardReceivablesMember_019e3b80-301c-7800-ad3a-150073c82117" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditCardReceivablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7707-85fb-c4dc1300b161" xlink:to="loc_us-gaap_CreditCardReceivablesMember_019e3b80-301c-7800-ad3a-150073c82117" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-703b-b45b-7cab6d8fa30d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_019e3b80-301c-7ccb-a388-8c486a82dfd6" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-703b-b45b-7cab6d8fa30d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-703b-b45b-7cab6d8fa30d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-703b-b45b-7cab6d8fa30d" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-703b-b45b-7cab6d8fa30d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-74c9-9640-696d64567b73" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-703b-b45b-7cab6d8fa30d" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-74c9-9640-696d64567b73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_019e3b80-301c-74fd-b5c8-b033bbee292e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-74c9-9640-696d64567b73" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_019e3b80-301c-74fd-b5c8-b033bbee292e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_019e3b80-301c-75f2-9c84-b21b14731eb1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-74c9-9640-696d64567b73" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_019e3b80-301c-75f2-9c84-b21b14731eb1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_ConstructionPortfolioSegmentMember_019e3b80-301c-7647-bd31-22b171479646" xlink:href="cbnk-20260630.xsd#cbnk_ConstructionPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-74c9-9640-696d64567b73" xlink:to="loc_cbnk_ConstructionPortfolioSegmentMember_019e3b80-301c-7647-bd31-22b171479646" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_CommercialAndIndustrialPortfolioSegmentMember_019e3b80-301c-7469-af8b-c014fd60a21a" xlink:href="cbnk-20260630.xsd#cbnk_CommercialAndIndustrialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-74c9-9640-696d64567b73" xlink:to="loc_cbnk_CommercialAndIndustrialPortfolioSegmentMember_019e3b80-301c-7469-af8b-c014fd60a21a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_019e3b80-301c-7a09-956a-5eb0640ba831" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-74c9-9640-696d64567b73" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_019e3b80-301c-7a09-956a-5eb0640ba831" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentAxis_019e3b80-301c-7604-9181-629e8d2ac675" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InternalCreditAssessmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_019e3b80-301c-7ccb-a388-8c486a82dfd6" xlink:to="loc_us-gaap_InternalCreditAssessmentAxis_019e3b80-301c-7604-9181-629e8d2ac675" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentDomain_019e3b80-301c-7604-9181-629e8d2ac675_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InternalCreditAssessmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InternalCreditAssessmentAxis_019e3b80-301c-7604-9181-629e8d2ac675" xlink:to="loc_us-gaap_InternalCreditAssessmentDomain_019e3b80-301c-7604-9181-629e8d2ac675_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentDomain_019e3b80-301c-71c7-b7a4-7a8362ec7a24" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InternalCreditAssessmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InternalCreditAssessmentAxis_019e3b80-301c-7604-9181-629e8d2ac675" xlink:to="loc_us-gaap_InternalCreditAssessmentDomain_019e3b80-301c-71c7-b7a4-7a8362ec7a24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PassMember_019e3b80-301c-7dc0-ad36-c67945e19208" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PassMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_019e3b80-301c-71c7-b7a4-7a8362ec7a24" xlink:to="loc_us-gaap_PassMember_019e3b80-301c-7dc0-ad36-c67945e19208" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SpecialMentionMember_019e3b80-301c-7fb5-aeb3-21d4d3db0a88" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SpecialMentionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_019e3b80-301c-71c7-b7a4-7a8362ec7a24" xlink:to="loc_us-gaap_SpecialMentionMember_019e3b80-301c-7fb5-aeb3-21d4d3db0a88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubstandardMember_019e3b80-301c-7177-849b-2d8ec2e60a3c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubstandardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_019e3b80-301c-71c7-b7a4-7a8362ec7a24" xlink:to="loc_us-gaap_SubstandardMember_019e3b80-301c-7177-849b-2d8ec2e60a3c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DoubtfulMember_019e3b80-301c-767e-afab-34c7d653c802" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DoubtfulMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_019e3b80-301c-71c7-b7a4-7a8362ec7a24" xlink:to="loc_us-gaap_DoubtfulMember_019e3b80-301c-767e-afab-34c7d653c802" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_UngradedMember_019e3b80-301c-7ca6-b60b-ae849a3b9c29" xlink:href="cbnk-20260630.xsd#cbnk_UngradedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_019e3b80-301c-71c7-b7a4-7a8362ec7a24" xlink:to="loc_cbnk_UngradedMember_019e3b80-301c-7ca6-b60b-ae849a3b9c29" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract_019e3b80-301c-7144-b350-37fbe6150754" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019e3b80-301c-71f3-9ad4-2b4470ac8531" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract_019e3b80-301c-7144-b350-37fbe6150754" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_019e3b80-301c-705f-bc5a-a78ac9c72f04" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract_019e3b80-301c-7144-b350-37fbe6150754" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_019e3b80-301c-705f-bc5a-a78ac9c72f04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_019e3b80-301c-7e85-a43b-08faa4df6da9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract_019e3b80-301c-7144-b350-37fbe6150754" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_019e3b80-301c-7e85-a43b-08faa4df6da9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_019e3b80-301c-7ee5-9246-13fedc26ffe3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract_019e3b80-301c-7144-b350-37fbe6150754" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_019e3b80-301c-7ee5-9246-13fedc26ffe3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_019e3b80-301c-761e-9492-4312a1937943" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract_019e3b80-301c-7144-b350-37fbe6150754" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_019e3b80-301c-761e-9492-4312a1937943" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_019e3b80-301c-7ce1-9939-ffd0c6a08967" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract_019e3b80-301c-7144-b350-37fbe6150754" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_019e3b80-301c-7ce1-9939-ffd0c6a08967" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_019e3b80-301c-77ca-ab20-b32c85e7f62a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract_019e3b80-301c-7144-b350-37fbe6150754" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_019e3b80-301c-77ca-ab20-b32c85e7f62a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolving_019e3b80-301c-79f1-ab76-372765057cda" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestRevolving"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract_019e3b80-301c-7144-b350-37fbe6150754" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolving_019e3b80-301c-79f1-ab76-372765057cda" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019e3b80-301c-7920-8511-ec7ceebe3695" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract_019e3b80-301c-7144-b350-37fbe6150754" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019e3b80-301c-7920-8511-ec7ceebe3695" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_019e3b80-301c-7b25-8808-aca0fe567e27" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019e3b80-301c-71f3-9ad4-2b4470ac8531" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_019e3b80-301c-7b25-8808-aca0fe567e27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff_019e3b80-301c-716a-9a4b-cf9b95fbec8a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_019e3b80-301c-7b25-8808-aca0fe567e27" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff_019e3b80-301c-716a-9a4b-cf9b95fbec8a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff_019e3b80-301c-7e34-8cd9-72d3aa6d85bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_019e3b80-301c-7b25-8808-aca0fe567e27" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff_019e3b80-301c-7e34-8cd9-72d3aa6d85bc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff_019e3b80-301c-7b11-bd05-676f5af97061" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_019e3b80-301c-7b25-8808-aca0fe567e27" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff_019e3b80-301c-7b11-bd05-676f5af97061" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff_019e3b80-301c-7938-98cd-549f656148b2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_019e3b80-301c-7b25-8808-aca0fe567e27" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff_019e3b80-301c-7938-98cd-549f656148b2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff_019e3b80-301c-7262-8e8e-4cc604a03715" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_019e3b80-301c-7b25-8808-aca0fe567e27" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff_019e3b80-301c-7262-8e8e-4cc604a03715" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff_019e3b80-301c-71d6-9c0c-996be3175fd2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_019e3b80-301c-7b25-8808-aca0fe567e27" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff_019e3b80-301c-71d6-9c0c-996be3175fd2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff_019e3b80-301c-7f0e-90f5-139d14241dec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_019e3b80-301c-7b25-8808-aca0fe567e27" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff_019e3b80-301c-7f0e-90f5-139d14241dec" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019e3b80-301c-7af3-a832-b91a3d688369" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_019e3b80-301c-7b25-8808-aca0fe567e27" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019e3b80-301c-7af3-a832-b91a3d688369" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/PortfolioLoansReceivableandAllowanceforCreditLossesScheduleofOutstandingLoanCommitmentsDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#PortfolioLoansReceivableandAllowanceforCreditLossesScheduleofOutstandingLoanCommitmentsDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/PortfolioLoansReceivableandAllowanceforCreditLossesScheduleofOutstandingLoanCommitmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e3b80-301c-7188-b52b-88d66fe5a3cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e3b80-301c-7f0c-a2d8-e8cdc9d83b91" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e3b80-301c-7188-b52b-88d66fe5a3cd" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e3b80-301c-7f0c-a2d8-e8cdc9d83b91" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e3b80-301c-7188-8623-989ceaf105ab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e3b80-301c-7f0c-a2d8-e8cdc9d83b91" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e3b80-301c-7188-8623-989ceaf105ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-7188-8623-989ceaf105ab_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e3b80-301c-7188-8623-989ceaf105ab" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-7188-8623-989ceaf105ab_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-732d-9288-62f57db16560" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e3b80-301c-7188-8623-989ceaf105ab" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-732d-9288-62f57db16560" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsToExtendCreditMember_019e3b80-301c-70f5-8049-07fcedb9e2c1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommitmentsToExtendCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301c-732d-9288-62f57db16560" xlink:to="loc_us-gaap_CommitmentsToExtendCreditMember_019e3b80-301c-70f5-8049-07fcedb9e2c1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-7c71-9830-3853d2838b4a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e3b80-301c-7f0c-a2d8-e8cdc9d83b91" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-7c71-9830-3853d2838b4a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7c71-9830-3853d2838b4a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-7c71-9830-3853d2838b4a" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7c71-9830-3853d2838b4a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-76bd-a58d-c0dd3675d438" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-7c71-9830-3853d2838b4a" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-76bd-a58d-c0dd3675d438" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateLoanMember_019e3b80-301c-7295-8e86-07bc9441f363" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RealEstateLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-76bd-a58d-c0dd3675d438" xlink:to="loc_us-gaap_RealEstateLoanMember_019e3b80-301c-7295-8e86-07bc9441f363" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HomeEquityLoanMember_019e3b80-301c-795f-857b-e29960a1bf29" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HomeEquityLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-76bd-a58d-c0dd3675d438" xlink:to="loc_us-gaap_HomeEquityLoanMember_019e3b80-301c-795f-857b-e29960a1bf29" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditCardReceivablesMember_019e3b80-301c-7176-8c5a-75ea4aa41d6f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditCardReceivablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-76bd-a58d-c0dd3675d438" xlink:to="loc_us-gaap_CreditCardReceivablesMember_019e3b80-301c-7176-8c5a-75ea4aa41d6f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OtherConsumerMember_019e3b80-301c-728c-ab7b-4f9d720a0ce5" xlink:href="cbnk-20260630.xsd#cbnk_OtherConsumerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-76bd-a58d-c0dd3675d438" xlink:to="loc_cbnk_OtherConsumerMember_019e3b80-301c-728c-ab7b-4f9d720a0ce5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-7c93-bf6f-445723997e70" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e3b80-301c-7f0c-a2d8-e8cdc9d83b91" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-7c93-bf6f-445723997e70" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7c93-bf6f-445723997e70_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-7c93-bf6f-445723997e70" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7c93-bf6f-445723997e70_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7196-abfc-21b61d3fe976" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e3b80-301c-7c93-bf6f-445723997e70" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7196-abfc-21b61d3fe976" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_019e3b80-301c-71f7-b222-c5b019e97c82" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7196-abfc-21b61d3fe976" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_019e3b80-301c-71f7-b222-c5b019e97c82" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_019e3b80-301c-7d7e-b823-4d28e281f2b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7196-abfc-21b61d3fe976" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_019e3b80-301c-7d7e-b823-4d28e281f2b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_ConstructionPortfolioSegmentMember_019e3b80-301c-7456-9111-aac72e7ad695" xlink:href="cbnk-20260630.xsd#cbnk_ConstructionPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7196-abfc-21b61d3fe976" xlink:to="loc_cbnk_ConstructionPortfolioSegmentMember_019e3b80-301c-7456-9111-aac72e7ad695" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_CommercialAndIndustrialPortfolioSegmentMember_019e3b80-301c-7bac-a8a9-ba2429292431" xlink:href="cbnk-20260630.xsd#cbnk_CommercialAndIndustrialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7196-abfc-21b61d3fe976" xlink:to="loc_cbnk_CommercialAndIndustrialPortfolioSegmentMember_019e3b80-301c-7bac-a8a9-ba2429292431" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_019e3b80-301c-7cc5-b78c-27fe8bd080c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e3b80-301c-7196-abfc-21b61d3fe976" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_019e3b80-301c-7cc5-b78c-27fe8bd080c2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralAxis_019e3b80-301c-7aac-afd8-ec949489bc3b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e3b80-301c-7f0c-a2d8-e8cdc9d83b91" xlink:to="loc_us-gaap_CollateralAxis_019e3b80-301c-7aac-afd8-ec949489bc3b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralDomain_019e3b80-301c-7aac-afd8-ec949489bc3b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CollateralAxis_019e3b80-301c-7aac-afd8-ec949489bc3b" xlink:to="loc_us-gaap_CollateralDomain_019e3b80-301c-7aac-afd8-ec949489bc3b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralDomain_019e3b80-301c-7f9f-839a-13b76770e3e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CollateralAxis_019e3b80-301c-7aac-afd8-ec949489bc3b" xlink:to="loc_us-gaap_CollateralDomain_019e3b80-301c-7f9f-839a-13b76770e3e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_SavingsDepositsMember_019e3b80-301c-782a-b161-d03e0e9447db" xlink:href="cbnk-20260630.xsd#cbnk_SavingsDepositsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CollateralDomain_019e3b80-301c-7f9f-839a-13b76770e3e7" xlink:to="loc_cbnk_SavingsDepositsMember_019e3b80-301c-782a-b161-d03e0e9447db" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnusedCommitmentsToExtendCredit_019e3b80-301c-7cbc-b182-2accb8bde2ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnusedCommitmentsToExtendCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e3b80-301c-7188-b52b-88d66fe5a3cd" xlink:to="loc_us-gaap_UnusedCommitmentsToExtendCredit_019e3b80-301c-7cbc-b182-2accb8bde2ec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_019e3b80-301c-7e73-840a-d60d5c868356" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e3b80-301c-7188-b52b-88d66fe5a3cd" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_019e3b80-301c-7e73-840a-d60d5c868356" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019e3b80-301c-7274-b8ec-07e68828f4b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e3b80-301c-7188-b52b-88d66fe5a3cd" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019e3b80-301c-7274-b8ec-07e68828f4b1" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/PortfolioLoansReceivableandAllowanceforCreditLossesScheduleofCreditLossesforFinancingReceivablesDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#PortfolioLoansReceivableandAllowanceforCreditLossesScheduleofCreditLossesforFinancingReceivablesDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/PortfolioLoansReceivableandAllowanceforCreditLossesScheduleofCreditLossesforFinancingReceivablesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e3b80-301c-7e04-b856-b8fd2d668234" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e3b80-301c-7587-b771-511a49a507b6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e3b80-301c-7e04-b856-b8fd2d668234" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e3b80-301c-7587-b771-511a49a507b6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-703e-994c-a7d36040066d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e3b80-301c-7587-b771-511a49a507b6" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-703e-994c-a7d36040066d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-703e-994c-a7d36040066d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-703e-994c-a7d36040066d" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-703e-994c-a7d36040066d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7580-b65b-e3872cd70dc5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019e3b80-301c-703e-994c-a7d36040066d" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7580-b65b-e3872cd70dc5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnfundedLoanCommitmentMember_019e3b80-301c-7ed0-9de9-f026b0eb4e11" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnfundedLoanCommitmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7580-b65b-e3872cd70dc5" xlink:to="loc_us-gaap_UnfundedLoanCommitmentMember_019e3b80-301c-7ed0-9de9-f026b0eb4e11" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_MortgageLoansSoldMember_019e3b80-301c-7099-b39e-4308941c2d5f" xlink:href="cbnk-20260630.xsd#cbnk_MortgageLoansSoldMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019e3b80-301c-7580-b65b-e3872cd70dc5" xlink:to="loc_cbnk_MortgageLoansSoldMember_019e3b80-301c-7099-b39e-4308941c2d5f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_019e3b80-301c-77a8-82cb-aec7fb41a68c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e3b80-301c-7e04-b856-b8fd2d668234" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_019e3b80-301c-77a8-82cb-aec7fb41a68c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019e3b80-301c-7077-a558-ce0d9aad266a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_019e3b80-301c-77a8-82cb-aec7fb41a68c" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019e3b80-301c-7077-a558-ce0d9aad266a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossReserveUtilizationGainLoss_019fb627-37f1-7729-99ac-be2f247454c7" xlink:href="cbnk-20260630.xsd#cbnk_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossReserveUtilizationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_019e3b80-301c-77a8-82cb-aec7fb41a68c" xlink:to="loc_cbnk_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossReserveUtilizationGainLoss_019fb627-37f1-7729-99ac-be2f247454c7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal_019e3b80-301c-7730-a93c-ae85a05076b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_019e3b80-301c-77a8-82cb-aec7fb41a68c" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal_019e3b80-301c-7730-a93c-ae85a05076b4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019e3b80-301c-7005-9b71-0cb01edf20ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/DerivativeFinancialInstrumentsScheduleofNotionalAmountandEstimatedFairValueofDerivativesDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#DerivativeFinancialInstrumentsScheduleofNotionalAmountandEstimatedFairValueofDerivativesDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/DerivativeFinancialInstrumentsScheduleofNotionalAmountandEstimatedFairValueofDerivativesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_019e3b80-301c-7089-b000-cfb557b911dd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativesFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019e3b80-301c-7372-a2e3-6b985999effc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019e3b80-301c-7089-b000-cfb557b911dd" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019e3b80-301c-7372-a2e3-6b985999effc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019e3b80-301c-7bfe-b14e-1560073abd60" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019e3b80-301c-7372-a2e3-6b985999effc" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019e3b80-301c-7bfe-b14e-1560073abd60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e3b80-301c-7bfe-b14e-1560073abd60_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e3b80-301c-7bfe-b14e-1560073abd60" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e3b80-301c-7bfe-b14e-1560073abd60_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e3b80-301c-782b-8805-55642c34f8fa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e3b80-301c-7bfe-b14e-1560073abd60" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e3b80-301c-782b-8805-55642c34f8fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanOriginationCommitmentsMember_019e3b80-301c-7642-93d1-52b2fa484057" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoanOriginationCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e3b80-301c-782b-8805-55642c34f8fa" xlink:to="loc_us-gaap_LoanOriginationCommitmentsMember_019e3b80-301c-7642-93d1-52b2fa484057" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OpenForwardDeliverySalesAgreementHedgeMarkToMarketMember_019e3b80-301c-76c6-beb6-5a63d428ccc5" xlink:href="cbnk-20260630.xsd#cbnk_OpenForwardDeliverySalesAgreementHedgeMarkToMarketMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e3b80-301c-782b-8805-55642c34f8fa" xlink:to="loc_cbnk_OpenForwardDeliverySalesAgreementHedgeMarkToMarketMember_019e3b80-301c-76c6-beb6-5a63d428ccc5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OpenMandatoryDeliveryCommitmentsMember_019e3b80-301c-7f41-9fff-f1e4b4630fc6" xlink:href="cbnk-20260630.xsd#cbnk_OpenMandatoryDeliveryCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e3b80-301c-782b-8805-55642c34f8fa" xlink:to="loc_cbnk_OpenMandatoryDeliveryCommitmentsMember_019e3b80-301c-7f41-9fff-f1e4b4630fc6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OpenForwardDeliverySalesAgreementPipelineHedgeMember_019e3b80-301c-7cbd-ab53-e1dde90fefd1" xlink:href="cbnk-20260630.xsd#cbnk_OpenForwardDeliverySalesAgreementPipelineHedgeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e3b80-301c-782b-8805-55642c34f8fa" xlink:to="loc_cbnk_OpenForwardDeliverySalesAgreementPipelineHedgeMember_019e3b80-301c-7cbd-ab53-e1dde90fefd1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsAbstract_019e3b80-301c-7c3c-b280-d388e08e1646" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019e3b80-301c-7089-b000-cfb557b911dd" xlink:to="loc_us-gaap_DerivativeAssetsAbstract_019e3b80-301c-7c3c-b280-d388e08e1646" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetNotionalAmount_019e3b80-301c-7974-8211-bd1891301d18" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssetNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_019e3b80-301c-7c3c-b280-d388e08e1646" xlink:to="loc_us-gaap_DerivativeAssetNotionalAmount_019e3b80-301c-7974-8211-bd1891301d18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019e3b80-301c-7e1d-b794-84f6dc78354c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_019e3b80-301c-7c3c-b280-d388e08e1646" xlink:to="loc_us-gaap_DerivativeAssets_019e3b80-301c-7e1d-b794-84f6dc78354c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilitiesAbstract_019e3b80-301c-7b92-855e-f393c68f3311" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019e3b80-301c-7089-b000-cfb557b911dd" xlink:to="loc_us-gaap_DerivativeLiabilitiesAbstract_019e3b80-301c-7b92-855e-f393c68f3311" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityNotionalAmount_019e3b80-301c-71b1-ba1c-5abb17bf8445" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilityNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilitiesAbstract_019e3b80-301c-7b92-855e-f393c68f3311" xlink:to="loc_us-gaap_DerivativeLiabilityNotionalAmount_019e3b80-301c-71b1-ba1c-5abb17bf8445" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_019e3b80-301c-7100-b9e2-37115b0ac85b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilitiesAbstract_019e3b80-301c-7b92-855e-f393c68f3311" xlink:to="loc_us-gaap_DerivativeLiabilities_019e3b80-301c-7100-b9e2-37115b0ac85b" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/DerivativeFinancialInstrumentsScheduleofNetGainsLossesRelatedtoDerivativeInstrumentsDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#DerivativeFinancialInstrumentsScheduleofNetGainsLossesRelatedtoDerivativeInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/DerivativeFinancialInstrumentsScheduleofNetGainsLossesRelatedtoDerivativeInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019e3b80-301c-7e3d-9532-0561d4a42737" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019e3b80-301c-769d-a3c9-cee2780c472a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019e3b80-301c-7e3d-9532-0561d4a42737" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019e3b80-301c-769d-a3c9-cee2780c472a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019e3b80-301c-7a86-9869-e88e741d105f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019e3b80-301c-769d-a3c9-cee2780c472a" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019e3b80-301c-7a86-9869-e88e741d105f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e3b80-301c-7a86-9869-e88e741d105f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e3b80-301c-7a86-9869-e88e741d105f" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e3b80-301c-7a86-9869-e88e741d105f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e3b80-301c-7967-a431-bf8e334b59ba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e3b80-301c-7a86-9869-e88e741d105f" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e3b80-301c-7967-a431-bf8e334b59ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanOriginationCommitmentsMember_019e3b80-301c-7b17-b32f-57fa6662bc51" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoanOriginationCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e3b80-301c-7967-a431-bf8e334b59ba" xlink:to="loc_us-gaap_LoanOriginationCommitmentsMember_019e3b80-301c-7b17-b32f-57fa6662bc51" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OpenForwardDeliverySalesAgreementHedgeMarkToMarketMember_019e3b80-301c-7e10-9751-71b64b42ff95" xlink:href="cbnk-20260630.xsd#cbnk_OpenForwardDeliverySalesAgreementHedgeMarkToMarketMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e3b80-301c-7967-a431-bf8e334b59ba" xlink:to="loc_cbnk_OpenForwardDeliverySalesAgreementHedgeMarkToMarketMember_019e3b80-301c-7e10-9751-71b64b42ff95" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OpenForwardDeliverySalesAgreementPipelineHedgeMember_019e3b80-301c-7d93-9a71-05eca57476da" xlink:href="cbnk-20260630.xsd#cbnk_OpenForwardDeliverySalesAgreementPipelineHedgeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e3b80-301c-7967-a431-bf8e334b59ba" xlink:to="loc_cbnk_OpenForwardDeliverySalesAgreementPipelineHedgeMember_019e3b80-301c-7d93-9a71-05eca57476da" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OpenMandatoryDeliveryCommitmentsMember_019e3b80-301c-7b40-90f5-9fe7a9fd5f98" xlink:href="cbnk-20260630.xsd#cbnk_OpenMandatoryDeliveryCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e3b80-301c-7967-a431-bf8e334b59ba" xlink:to="loc_cbnk_OpenMandatoryDeliveryCommitmentsMember_019e3b80-301c-7b40-90f5-9fe7a9fd5f98" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_019e3b80-301c-7664-9369-731d8f5a3243" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeGainLossOnDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019e3b80-301c-7e3d-9532-0561d4a42737" xlink:to="loc_us-gaap_DerivativeGainLossOnDerivativeNet_019e3b80-301c-7664-9369-731d8f5a3243" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/LeasesNarrativeDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#LeasesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/LeasesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e3b80-301c-79aa-a6d6-5c81f65b9079" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_019e3b80-301c-72e6-925e-a30104468572" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e3b80-301c-79aa-a6d6-5c81f65b9079" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_019e3b80-301c-72e6-925e-a30104468572" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e3b80-301c-7cd9-a061-b46c7c0c9995" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_019e3b80-301c-72e6-925e-a30104468572" xlink:to="loc_srt_RangeAxis_019e3b80-301c-7cd9-a061-b46c7c0c9995" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e3b80-301c-7cd9-a061-b46c7c0c9995_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019e3b80-301c-7cd9-a061-b46c7c0c9995" xlink:to="loc_srt_RangeMember_019e3b80-301c-7cd9-a061-b46c7c0c9995_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e3b80-301c-769e-a7fd-7546ee31ef27" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019e3b80-301c-7cd9-a061-b46c7c0c9995" xlink:to="loc_srt_RangeMember_019e3b80-301c-769e-a7fd-7546ee31ef27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e3b80-301c-7051-8945-9ff5ff0f1df0" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e3b80-301c-769e-a7fd-7546ee31ef27" xlink:to="loc_srt_MinimumMember_019e3b80-301c-7051-8945-9ff5ff0f1df0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e3b80-301c-7f56-acab-fb6190dc719e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e3b80-301c-769e-a7fd-7546ee31ef27" xlink:to="loc_srt_MaximumMember_019e3b80-301c-7f56-acab-fb6190dc719e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermAxis_019fb130-0145-7c44-9b5b-4d7dde1fc967" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LeaseContractualTermAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_019e3b80-301c-72e6-925e-a30104468572" xlink:to="loc_us-gaap_LeaseContractualTermAxis_019fb130-0145-7c44-9b5b-4d7dde1fc967" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_019fb130-0145-7c44-9b5b-4d7dde1fc967_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LeaseContractualTermAxis_019fb130-0145-7c44-9b5b-4d7dde1fc967" xlink:to="loc_us-gaap_LeaseContractualTermDomain_019fb130-0145-7c44-9b5b-4d7dde1fc967_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_019fb130-0145-793c-bc78-39ba56c9f362" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LeaseContractualTermAxis_019fb130-0145-7c44-9b5b-4d7dde1fc967" xlink:to="loc_us-gaap_LeaseContractualTermDomain_019fb130-0145-793c-bc78-39ba56c9f362" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_LeaseContractualTermAnnapolisMarylandMember_019fb130-0145-7232-a34b-970f3f805c30" xlink:href="cbnk-20260630.xsd#cbnk_LeaseContractualTermAnnapolisMarylandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_019fb130-0145-793c-bc78-39ba56c9f362" xlink:to="loc_cbnk_LeaseContractualTermAnnapolisMarylandMember_019fb130-0145-7232-a34b-970f3f805c30" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_LeaseContractualTermTowsonMarylandMember_019fb130-0145-7226-87eb-99e164d2b504" xlink:href="cbnk-20260630.xsd#cbnk_LeaseContractualTermTowsonMarylandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_019fb130-0145-793c-bc78-39ba56c9f362" xlink:to="loc_cbnk_LeaseContractualTermTowsonMarylandMember_019fb130-0145-7226-87eb-99e164d2b504" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_LesseeOperatingLeaseNumberOfFullServiceBranches_019e3b80-301c-79d2-83b8-a5f825e8f6f0" xlink:href="cbnk-20260630.xsd#cbnk_LesseeOperatingLeaseNumberOfFullServiceBranches"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e3b80-301c-79aa-a6d6-5c81f65b9079" xlink:to="loc_cbnk_LesseeOperatingLeaseNumberOfFullServiceBranches_019e3b80-301c-79d2-83b8-a5f825e8f6f0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_LesseeOperatingLeaseNumberOfOtherLocations_019e3b80-301c-7625-a2cb-2b66d13383fe" xlink:href="cbnk-20260630.xsd#cbnk_LesseeOperatingLeaseNumberOfOtherLocations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e3b80-301c-79aa-a6d6-5c81f65b9079" xlink:to="loc_cbnk_LesseeOperatingLeaseNumberOfOtherLocations_019e3b80-301c-7625-a2cb-2b66d13383fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_019e3b80-301c-783d-aed4-f6996afac6e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e3b80-301c-79aa-a6d6-5c81f65b9079" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_019e3b80-301c-783d-aed4-f6996afac6e7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OperatingLeaseRightOfUseAssetNet_019e3b80-301c-7080-9c14-b0e7d31433e2" xlink:href="cbnk-20260630.xsd#cbnk_OperatingLeaseRightOfUseAssetNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e3b80-301c-79aa-a6d6-5c81f65b9079" xlink:to="loc_cbnk_OperatingLeaseRightOfUseAssetNet_019e3b80-301c-7080-9c14-b0e7d31433e2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_019e3b80-301c-783b-ac1d-bcd6fb5b6e4f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e3b80-301c-79aa-a6d6-5c81f65b9079" xlink:to="loc_us-gaap_OperatingLeaseLiability_019e3b80-301c-783b-ac1d-bcd6fb5b6e4f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_LesseeOperatingLeaseRemainingTermOfContract_019e3b80-301c-7a56-8f0f-5f070ddfd363" xlink:href="cbnk-20260630.xsd#cbnk_LesseeOperatingLeaseRemainingTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e3b80-301c-79aa-a6d6-5c81f65b9079" xlink:to="loc_cbnk_LesseeOperatingLeaseRemainingTermOfContract_019e3b80-301c-7a56-8f0f-5f070ddfd363" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_019fd2e6-4021-716a-8fdf-1bb915b94e7a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e3b80-301c-79aa-a6d6-5c81f65b9079" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_019fd2e6-4021-716a-8fdf-1bb915b94e7a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_NumberOfLeaseAgreementsNotYetCommenced_019fb2ed-6f79-7d4a-b4fe-518d6b4dc6c3" xlink:href="cbnk-20260630.xsd#cbnk_NumberOfLeaseAgreementsNotYetCommenced"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e3b80-301c-79aa-a6d6-5c81f65b9079" xlink:to="loc_cbnk_NumberOfLeaseAgreementsNotYetCommenced_019fb2ed-6f79-7d4a-b4fe-518d6b4dc6c3" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1_019fb130-0145-741d-b2b2-9423e9f10dae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e3b80-301c-79aa-a6d6-5c81f65b9079" xlink:to="loc_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1_019fb130-0145-741d-b2b2-9423e9f10dae" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount_019fb130-0145-7261-a69a-e885d9277d87" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e3b80-301c-79aa-a6d6-5c81f65b9079" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount_019fb130-0145-7261-a69a-e885d9277d87" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/GoodwillandIntangibleAssetsScheduleofAcquiredIntangibleAssetsDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#GoodwillandIntangibleAssetsScheduleofAcquiredIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/GoodwillandIntangibleAssetsScheduleofAcquiredIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e3b80-301d-724e-b055-f15f979ef125" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019e3b80-301d-7412-b0b1-a226e204649c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e3b80-301d-724e-b055-f15f979ef125" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019e3b80-301d-7412-b0b1-a226e204649c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e3b80-301d-7b23-a111-238602c6b6f2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019e3b80-301d-7412-b0b1-a226e204649c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e3b80-301d-7b23-a111-238602c6b6f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e3b80-301d-7b23-a111-238602c6b6f2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e3b80-301d-7b23-a111-238602c6b6f2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e3b80-301d-7b23-a111-238602c6b6f2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e3b80-301d-7aee-a4ad-7ca1dd057002" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e3b80-301d-7b23-a111-238602c6b6f2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e3b80-301d-7aee-a4ad-7ca1dd057002" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerListsMember_019e3b80-301d-7561-82fc-6b535f330617" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CustomerListsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e3b80-301d-7aee-a4ad-7ca1dd057002" xlink:to="loc_us-gaap_CustomerListsMember_019e3b80-301d-7561-82fc-6b535f330617" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_019e3b80-301d-75d2-a4bb-cee8da5ef0e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e3b80-301d-7aee-a4ad-7ca1dd057002" xlink:to="loc_us-gaap_TradeNamesMember_019e3b80-301d-75d2-a4bb-cee8da5ef0e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CoreDepositsMember_019e3b80-301d-7c5b-b5db-0c0e1fa8efc1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CoreDepositsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e3b80-301d-7aee-a4ad-7ca1dd057002" xlink:to="loc_us-gaap_CoreDepositsMember_019e3b80-301d-7c5b-b5db-0c0e1fa8efc1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNetAbstract_019e3b80-301d-7a1d-b448-ba65b28e45b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsNetAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e3b80-301d-724e-b055-f15f979ef125" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNetAbstract_019e3b80-301d-7a1d-b448-ba65b28e45b0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019e3b80-301d-7c3f-92e9-6310d5704565" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNetAbstract_019e3b80-301d-7a1d-b448-ba65b28e45b0" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019e3b80-301d-7c3f-92e9-6310d5704565" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019e3b80-301d-7073-b61f-bad4311314b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNetAbstract_019e3b80-301d-7a1d-b448-ba65b28e45b0" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019e3b80-301d-7073-b61f-bad4311314b5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019e3b80-301d-7d02-a255-4dd9e2e061ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNetAbstract_019e3b80-301d-7a1d-b448-ba65b28e45b0" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019e3b80-301d-7d02-a255-4dd9e2e061ea" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/GoodwillandIntangibleAssetsNarrativeDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#GoodwillandIntangibleAssetsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/GoodwillandIntangibleAssetsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e3b80-301d-7797-ba23-fa7b4234f8ed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019e3b80-301d-7602-99a2-5859bfce1c7c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e3b80-301d-7797-ba23-fa7b4234f8ed" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019e3b80-301d-7602-99a2-5859bfce1c7c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e3b80-301d-78db-abcd-ce2721a7ec4f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019e3b80-301d-7602-99a2-5859bfce1c7c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e3b80-301d-78db-abcd-ce2721a7ec4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e3b80-301d-78db-abcd-ce2721a7ec4f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e3b80-301d-78db-abcd-ce2721a7ec4f" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e3b80-301d-78db-abcd-ce2721a7ec4f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e3b80-301d-71fd-8976-2dd6323c0a96" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e3b80-301d-78db-abcd-ce2721a7ec4f" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e3b80-301d-71fd-8976-2dd6323c0a96" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerListsMember_019e3b80-301d-785b-9386-12fd91418dda" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CustomerListsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e3b80-301d-71fd-8976-2dd6323c0a96" xlink:to="loc_us-gaap_CustomerListsMember_019e3b80-301d-785b-9386-12fd91418dda" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_019e3b80-301d-7c0a-b446-b35282f48487" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e3b80-301d-71fd-8976-2dd6323c0a96" xlink:to="loc_us-gaap_TradeNamesMember_019e3b80-301d-7c0a-b446-b35282f48487" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CoreDepositsMember_019e3b80-301d-73b7-8924-3398837bc3f5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CoreDepositsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e3b80-301d-71fd-8976-2dd6323c0a96" xlink:to="loc_us-gaap_CoreDepositsMember_019e3b80-301d-73b7-8924-3398837bc3f5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_019e3b80-301d-76b4-931c-dc8f8eda03cc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e3b80-301d-7797-ba23-fa7b4234f8ed" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_019e3b80-301d-76b4-931c-dc8f8eda03cc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_019e3b80-301d-75cb-b673-c7f075b2a72a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e3b80-301d-7797-ba23-fa7b4234f8ed" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_019e3b80-301d-75cb-b673-c7f075b2a72a" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/FairValueFinancialInstrumentsMeasuredatFVonRecurringBasisDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#FairValueFinancialInstrumentsMeasuredatFVonRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/FairValueFinancialInstrumentsMeasuredatFVonRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3b80-301d-7603-b81a-d2ee79fd9dc6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e3b80-301d-71e0-9467-47bc24a8b269" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3b80-301d-7603-b81a-d2ee79fd9dc6" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e3b80-301d-71e0-9467-47bc24a8b269" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019e3b80-301d-7ffe-a948-e92b834584d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e3b80-301d-71e0-9467-47bc24a8b269" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019e3b80-301d-7ffe-a948-e92b834584d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e3b80-301d-7ffe-a948-e92b834584d4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019e3b80-301d-7ffe-a948-e92b834584d4" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e3b80-301d-7ffe-a948-e92b834584d4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e3b80-301d-793b-8836-4e81be04a2fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019e3b80-301d-7ffe-a948-e92b834584d4" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e3b80-301d-793b-8836-4e81be04a2fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_019e3b80-301d-73d1-aa1d-a52c0ba1c235" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e3b80-301d-793b-8836-4e81be04a2fb" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_019e3b80-301d-73d1-aa1d-a52c0ba1c235" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e3b80-301d-7125-9001-015daba03618" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e3b80-301d-71e0-9467-47bc24a8b269" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e3b80-301d-7125-9001-015daba03618" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301d-7125-9001-015daba03618_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e3b80-301d-7125-9001-015daba03618" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301d-7125-9001-015daba03618_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301d-740e-86ef-78200f0915cc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e3b80-301d-7125-9001-015daba03618" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301d-740e-86ef-78200f0915cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasurySecuritiesMember_019e3b80-301d-7b4c-b595-8a4dd764f2a1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USTreasurySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301d-740e-86ef-78200f0915cc" xlink:to="loc_us-gaap_USTreasurySecuritiesMember_019e3b80-301d-7b4c-b595-8a4dd764f2a1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MunicipalBondsMember_019e3b80-301d-7996-8450-f5bc2a59cbf2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MunicipalBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301d-740e-86ef-78200f0915cc" xlink:to="loc_us-gaap_MunicipalBondsMember_019e3b80-301d-7996-8450-f5bc2a59cbf2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019e3b80-301d-7a85-8375-3d91419da5c9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301d-740e-86ef-78200f0915cc" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019e3b80-301d-7a85-8375-3d91419da5c9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019e3b80-301d-7807-83f6-92480d7b515b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301d-740e-86ef-78200f0915cc" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019e3b80-301d-7807-83f6-92480d7b515b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesMember_019e3b80-301d-7f4d-984a-7a3aa1625fa6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e3b80-301d-740e-86ef-78200f0915cc" xlink:to="loc_us-gaap_MortgageBackedSecuritiesMember_019e3b80-301d-7f4d-984a-7a3aa1625fa6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e3b80-301d-7383-b3c6-70fa5b39c9b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e3b80-301d-71e0-9467-47bc24a8b269" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e3b80-301d-7383-b3c6-70fa5b39c9b4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-7383-b3c6-70fa5b39c9b4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e3b80-301d-7383-b3c6-70fa5b39c9b4" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-7383-b3c6-70fa5b39c9b4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-7c0e-bdf6-db132cbf2a1e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e3b80-301d-7383-b3c6-70fa5b39c9b4" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-7c0e-bdf6-db132cbf2a1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019e3b80-301d-7e4c-86eb-cd9085b99402" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-7c0e-bdf6-db132cbf2a1e" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019e3b80-301d-7e4c-86eb-cd9085b99402" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019e3b80-301d-7790-8c60-94d474e68dea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-7c0e-bdf6-db132cbf2a1e" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019e3b80-301d-7790-8c60-94d474e68dea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019e3b80-301d-7197-8073-0af62b4b4abc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-7c0e-bdf6-db132cbf2a1e" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019e3b80-301d-7197-8073-0af62b4b4abc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019e3b80-301d-7910-928a-78bc2e2818c4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3b80-301d-7603-b81a-d2ee79fd9dc6" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019e3b80-301d-7910-928a-78bc2e2818c4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansHeldForSaleFairValueDisclosure_019e3b80-301d-7a35-b911-c2b455a6fa72" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansHeldForSaleFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3b80-301d-7603-b81a-d2ee79fd9dc6" xlink:to="loc_us-gaap_LoansHeldForSaleFairValueDisclosure_019e3b80-301d-7a35-b911-c2b455a6fa72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetAtFairValueAmount_019e3b80-301d-75ff-b4af-49e36a6d2425" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetAtFairValueAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3b80-301d-7603-b81a-d2ee79fd9dc6" xlink:to="loc_us-gaap_ServicingAssetAtFairValueAmount_019e3b80-301d-75ff-b4af-49e36a6d2425" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019e3b80-301d-7b23-9daa-e0105730ee5b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3b80-301d-7603-b81a-d2ee79fd9dc6" xlink:to="loc_us-gaap_DerivativeAssets_019e3b80-301d-7b23-9daa-e0105730ee5b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration_019e3b80-301d-7b4c-86e6-f084ae26ae6e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssets_019e3b80-301d-7b23-9daa-e0105730ee5b" xlink:to="loc_us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration_019e3b80-301d-7b4c-86e6-f084ae26ae6e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_019e3b80-301d-7d7c-89d6-eec006b13143" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3b80-301d-7603-b81a-d2ee79fd9dc6" xlink:to="loc_us-gaap_DerivativeLiabilities_019e3b80-301d-7d7c-89d6-eec006b13143" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration_019e3b80-301d-710e-845d-7643ea33030a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilities_019e3b80-301d-7d7c-89d6-eec006b13143" xlink:to="loc_us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration_019e3b80-301d-710e-845d-7643ea33030a" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/FairValueLoansHeldForSaleDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#FairValueLoansHeldForSaleDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/FairValueLoansHeldForSaleDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019e3b80-301d-7141-98e2-7735c79050d9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019e3b80-301d-700b-b4a1-bb58197d60ae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019e3b80-301d-7141-98e2-7735c79050d9" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019e3b80-301d-700b-b4a1-bb58197d60ae" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_019e3b80-301d-753e-86cf-e0bc0555f902" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019e3b80-301d-700b-b4a1-bb58197d60ae" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_019e3b80-301d-753e-86cf-e0bc0555f902" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e3b80-301d-753e-86cf-e0bc0555f902_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019e3b80-301d-753e-86cf-e0bc0555f902" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e3b80-301d-753e-86cf-e0bc0555f902_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019e3b80-301d-76d3-9a61-29ce7bccea2f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019e3b80-301d-753e-86cf-e0bc0555f902" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019e3b80-301d-76d3-9a61-29ce7bccea2f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e3b80-301d-7bce-bdd0-03f9239fb529" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019e3b80-301d-76d3-9a61-29ce7bccea2f" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e3b80-301d-7bce-bdd0-03f9239fb529" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019e3b80-301d-7155-9792-600ce6badd2e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e3b80-301d-7bce-bdd0-03f9239fb529" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019e3b80-301d-7155-9792-600ce6badd2e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019e3b80-301d-77f9-a522-83156eb76eac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e3b80-301d-7bce-bdd0-03f9239fb529" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019e3b80-301d-77f9-a522-83156eb76eac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ChangeDuringPeriodFairValueDisclosureMember_019e3b80-301d-7e5d-b975-8d2072011ad5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ChangeDuringPeriodFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e3b80-301d-7bce-bdd0-03f9239fb529" xlink:to="loc_us-gaap_ChangeDuringPeriodFairValueDisclosureMember_019e3b80-301d-7e5d-b975-8d2072011ad5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansHeldForSaleFairValueDisclosure_019e3b80-301d-7102-9fd0-590f5715462b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansHeldForSaleFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019e3b80-301d-7141-98e2-7735c79050d9" xlink:to="loc_us-gaap_LoansHeldForSaleFairValueDisclosure_019e3b80-301d-7102-9fd0-590f5715462b" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/FairValueNarrativeDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#FairValueNarrativeDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/FairValueNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3b80-301d-7b88-9ef2-ccfe9835d867" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e3b80-301d-729e-bdee-f631f2b3e7f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3b80-301d-7b88-9ef2-ccfe9835d867" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e3b80-301d-729e-bdee-f631f2b3e7f8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e3b80-301d-7515-a95a-50cf6c6e87fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e3b80-301d-729e-bdee-f631f2b3e7f8" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e3b80-301d-7515-a95a-50cf6c6e87fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-7515-a95a-50cf6c6e87fb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e3b80-301d-7515-a95a-50cf6c6e87fb" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-7515-a95a-50cf6c6e87fb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-7a03-852a-70acc235c878" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e3b80-301d-7515-a95a-50cf6c6e87fb" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-7a03-852a-70acc235c878" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019e3b80-301d-7352-b61f-038584d4deef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-7a03-852a-70acc235c878" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019e3b80-301d-7352-b61f-038584d4deef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019e3b80-301d-7d6d-92c4-3fe05fb531c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e3b80-301d-729e-bdee-f631f2b3e7f8" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019e3b80-301d-7d6d-92c4-3fe05fb531c0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e3b80-301d-7d6d-92c4-3fe05fb531c0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019e3b80-301d-7d6d-92c4-3fe05fb531c0" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e3b80-301d-7d6d-92c4-3fe05fb531c0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e3b80-301d-7fb1-8be9-181c8d5dc761" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019e3b80-301d-7d6d-92c4-3fe05fb531c0" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e3b80-301d-7fb1-8be9-181c8d5dc761" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsNonrecurringMember_019e3b80-301d-779d-be1c-533ec60fd0be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsNonrecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e3b80-301d-7fb1-8be9-181c8d5dc761" xlink:to="loc_us-gaap_FairValueMeasurementsNonrecurringMember_019e3b80-301d-779d-be1c-533ec60fd0be" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_019e3b80-301d-73e1-b301-0af02759eca9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationTechniqueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e3b80-301d-729e-bdee-f631f2b3e7f8" xlink:to="loc_us-gaap_ValuationTechniqueAxis_019e3b80-301d-73e1-b301-0af02759eca9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_019e3b80-301d-73e1-b301-0af02759eca9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_019e3b80-301d-73e1-b301-0af02759eca9" xlink:to="loc_us-gaap_ValuationTechniqueDomain_019e3b80-301d-73e1-b301-0af02759eca9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_019e3b80-301d-759a-a393-2c1afcede456" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_019e3b80-301d-73e1-b301-0af02759eca9" xlink:to="loc_us-gaap_ValuationTechniqueDomain_019e3b80-301d-759a-a393-2c1afcede456" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_019e3b80-301d-7e24-beca-ce3263df5968" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationTechniqueDiscountedCashFlowMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_019e3b80-301d-759a-a393-2c1afcede456" xlink:to="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_019e3b80-301d-7e24-beca-ce3263df5968" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_LoanHeldForSaleNonaccrual_019e3b80-301d-75f8-8f4b-626df0a7eba2" xlink:href="cbnk-20260630.xsd#cbnk_LoanHeldForSaleNonaccrual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3b80-301d-7b88-9ef2-ccfe9835d867" xlink:to="loc_cbnk_LoanHeldForSaleNonaccrual_019e3b80-301d-75f8-8f4b-626df0a7eba2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment_019e3b80-301d-752d-969f-ff9dfe5ee4bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3b80-301d-7b88-9ef2-ccfe9835d867" xlink:to="loc_us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment_019e3b80-301d-752d-969f-ff9dfe5ee4bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_FinancingReceivableIndividuallyEvaluatedForImpairmentRelatedAllowance_019e3b80-301d-7b36-97bd-f9f73204f21d" xlink:href="cbnk-20260630.xsd#cbnk_FinancingReceivableIndividuallyEvaluatedForImpairmentRelatedAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3b80-301d-7b88-9ef2-ccfe9835d867" xlink:to="loc_cbnk_FinancingReceivableIndividuallyEvaluatedForImpairmentRelatedAllowance_019e3b80-301d-7b36-97bd-f9f73204f21d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateAcquiredThroughForeclosure_019e3b80-301d-7f71-b3e9-ac0a45e2e079" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RealEstateAcquiredThroughForeclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3b80-301d-7b88-9ef2-ccfe9835d867" xlink:to="loc_us-gaap_RealEstateAcquiredThroughForeclosure_019e3b80-301d-7f71-b3e9-ac0a45e2e079" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/FairValueFairValueMeasurementsNonrecurringDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#FairValueFairValueMeasurementsNonrecurringDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/FairValueFairValueMeasurementsNonrecurringDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3b80-301d-7aec-81ae-c28429c2f686" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e3b80-301d-7f0c-b311-6718ad221420" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3b80-301d-7aec-81ae-c28429c2f686" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e3b80-301d-7f0c-b311-6718ad221420" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019e3b80-301d-765d-9aa6-7e24d0b7b4d6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e3b80-301d-7f0c-b311-6718ad221420" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019e3b80-301d-765d-9aa6-7e24d0b7b4d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e3b80-301d-765d-9aa6-7e24d0b7b4d6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019e3b80-301d-765d-9aa6-7e24d0b7b4d6" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e3b80-301d-765d-9aa6-7e24d0b7b4d6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e3b80-301d-7162-8aea-d41b35ba04e8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019e3b80-301d-765d-9aa6-7e24d0b7b4d6" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e3b80-301d-7162-8aea-d41b35ba04e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsNonrecurringMember_019e3b80-301d-79c8-897c-3287775fb70f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsNonrecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e3b80-301d-7162-8aea-d41b35ba04e8" xlink:to="loc_us-gaap_FairValueMeasurementsNonrecurringMember_019e3b80-301d-79c8-897c-3287775fb70f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e3b80-301d-70d3-a381-97532d1e1888" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e3b80-301d-7f0c-b311-6718ad221420" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e3b80-301d-70d3-a381-97532d1e1888" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-70d3-a381-97532d1e1888_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e3b80-301d-70d3-a381-97532d1e1888" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-70d3-a381-97532d1e1888_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-745f-80f4-7a4643a8d47d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e3b80-301d-70d3-a381-97532d1e1888" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-745f-80f4-7a4643a8d47d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019e3b80-301d-7db9-b2d1-465160668e19" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-745f-80f4-7a4643a8d47d" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019e3b80-301d-7db9-b2d1-465160668e19" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment_019e3b80-301d-7b68-8bb8-9069a90c7826" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3b80-301d-7aec-81ae-c28429c2f686" xlink:to="loc_us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment_019e3b80-301d-7b68-8bb8-9069a90c7826" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateAcquiredThroughForeclosure_019e3b80-301d-7856-bd21-0d94179c62ca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RealEstateAcquiredThroughForeclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3b80-301d-7aec-81ae-c28429c2f686" xlink:to="loc_us-gaap_RealEstateAcquiredThroughForeclosure_019e3b80-301d-7856-bd21-0d94179c62ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019e3b80-301d-7833-8e64-9b868e6f8da9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3b80-301d-7aec-81ae-c28429c2f686" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_019e3b80-301d-7833-8e64-9b868e6f8da9" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/FairValueImpairedLoansandForeclosedRealEstateDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#FairValueImpairedLoansandForeclosedRealEstateDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/FairValueImpairedLoansandForeclosedRealEstateDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019e3b80-301d-7d85-a47f-c0c1afddc8ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019e3b80-301d-76fd-808a-e72eaa06d065" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019e3b80-301d-7d85-a47f-c0c1afddc8ea" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019e3b80-301d-76fd-808a-e72eaa06d065" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e3b80-301d-7bbc-88dd-cf9d90d97538" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019e3b80-301d-76fd-808a-e72eaa06d065" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e3b80-301d-7bbc-88dd-cf9d90d97538" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-7bbc-88dd-cf9d90d97538_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e3b80-301d-7bbc-88dd-cf9d90d97538" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-7bbc-88dd-cf9d90d97538_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-7194-9da6-a72713fb2833" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e3b80-301d-7bbc-88dd-cf9d90d97538" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-7194-9da6-a72713fb2833" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019e3b80-301d-7b49-ba4d-bf841cdb31db" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-7194-9da6-a72713fb2833" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019e3b80-301d-7b49-ba4d-bf841cdb31db" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_019e3b80-301d-7328-98e9-ed81282fffbc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019e3b80-301d-76fd-808a-e72eaa06d065" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_019e3b80-301d-7328-98e9-ed81282fffbc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_019e3b80-301d-7328-98e9-ed81282fffbc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_019e3b80-301d-7328-98e9-ed81282fffbc" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_019e3b80-301d-7328-98e9-ed81282fffbc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_019e3b80-301d-72fd-8775-0776c62c5a31" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_019e3b80-301d-7328-98e9-ed81282fffbc" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_019e3b80-301d-72fd-8775-0776c62c5a31" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_MeasurementInputDiscountsToAppraisalsOrCashFlowsForEstimatedHoldingAndSellingCostsMember_019e3b80-301d-7191-8002-74d48bb9ee48" xlink:href="cbnk-20260630.xsd#cbnk_MeasurementInputDiscountsToAppraisalsOrCashFlowsForEstimatedHoldingAndSellingCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019e3b80-301d-72fd-8775-0776c62c5a31" xlink:to="loc_cbnk_MeasurementInputDiscountsToAppraisalsOrCashFlowsForEstimatedHoldingAndSellingCostsMember_019e3b80-301d-7191-8002-74d48bb9ee48" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_MeasurementInputDiscountsToAppraisalsForEstimatedHoldingAndSellingCostsMember_019e3b80-301d-7b6d-8d76-5e49bc1e6d41" xlink:href="cbnk-20260630.xsd#cbnk_MeasurementInputDiscountsToAppraisalsForEstimatedHoldingAndSellingCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbnk_MeasurementInputDiscountsToAppraisalsOrCashFlowsForEstimatedHoldingAndSellingCostsMember_019e3b80-301d-7191-8002-74d48bb9ee48" xlink:to="loc_cbnk_MeasurementInputDiscountsToAppraisalsForEstimatedHoldingAndSellingCostsMember_019e3b80-301d-7b6d-8d76-5e49bc1e6d41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember_019e3b80-301d-78cd-ae35-e25ce5a15b07" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019e3b80-301d-72fd-8775-0776c62c5a31" xlink:to="loc_us-gaap_MeasurementInputDiscountRateMember_019e3b80-301d-78cd-ae35-e25ce5a15b07" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e3b80-301d-75ce-a011-295e9095dab6" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019e3b80-301d-76fd-808a-e72eaa06d065" xlink:to="loc_srt_RangeAxis_019e3b80-301d-75ce-a011-295e9095dab6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e3b80-301d-75ce-a011-295e9095dab6_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019e3b80-301d-75ce-a011-295e9095dab6" xlink:to="loc_srt_RangeMember_019e3b80-301d-75ce-a011-295e9095dab6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e3b80-301d-7c64-a79d-56657b0018dc" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019e3b80-301d-75ce-a011-295e9095dab6" xlink:to="loc_srt_RangeMember_019e3b80-301d-7c64-a79d-56657b0018dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e3b80-301d-7873-bca3-2e5d8d882dd1" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e3b80-301d-7c64-a79d-56657b0018dc" xlink:to="loc_srt_MinimumMember_019e3b80-301d-7873-bca3-2e5d8d882dd1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e3b80-301d-7d55-a54d-316f5214d011" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e3b80-301d-7c64-a79d-56657b0018dc" xlink:to="loc_srt_MaximumMember_019e3b80-301d-7d55-a54d-316f5214d011" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_019e3b80-301d-70d8-9604-59c04e60cb72" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationTechniqueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019e3b80-301d-76fd-808a-e72eaa06d065" xlink:to="loc_us-gaap_ValuationTechniqueAxis_019e3b80-301d-70d8-9604-59c04e60cb72" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_019e3b80-301d-70d8-9604-59c04e60cb72_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_019e3b80-301d-70d8-9604-59c04e60cb72" xlink:to="loc_us-gaap_ValuationTechniqueDomain_019e3b80-301d-70d8-9604-59c04e60cb72_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_019e3b80-301d-79b9-a4b1-8fb6c0727045" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_019e3b80-301d-70d8-9604-59c04e60cb72" xlink:to="loc_us-gaap_ValuationTechniqueDomain_019e3b80-301d-79b9-a4b1-8fb6c0727045" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_ValuationTechniqueAppraisedValueAndDiscountedCashFlowMember_019e3b80-301d-78e8-a22c-073562c254cf" xlink:href="cbnk-20260630.xsd#cbnk_ValuationTechniqueAppraisedValueAndDiscountedCashFlowMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_019e3b80-301d-79b9-a4b1-8fb6c0727045" xlink:to="loc_cbnk_ValuationTechniqueAppraisedValueAndDiscountedCashFlowMember_019e3b80-301d-78e8-a22c-073562c254cf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_ValuationTechniqueAppraisedValueMember_019e3b80-301d-7742-b404-e1e1e7d326f5" xlink:href="cbnk-20260630.xsd#cbnk_ValuationTechniqueAppraisedValueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbnk_ValuationTechniqueAppraisedValueAndDiscountedCashFlowMember_019e3b80-301d-78e8-a22c-073562c254cf" xlink:to="loc_cbnk_ValuationTechniqueAppraisedValueMember_019e3b80-301d-7742-b404-e1e1e7d326f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_FinancingReceivableIndividuallyEvaluatedForCreditLossMeasurementInput_019e3b80-301d-71e9-aa0d-383c6688f766" xlink:href="cbnk-20260630.xsd#cbnk_FinancingReceivableIndividuallyEvaluatedForCreditLossMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019e3b80-301d-7d85-a47f-c0c1afddc8ea" xlink:to="loc_cbnk_FinancingReceivableIndividuallyEvaluatedForCreditLossMeasurementInput_019e3b80-301d-71e9-aa0d-383c6688f766" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_RealEstateAcquiredThroughForeclosureMeasurementInput_019e3b80-301d-730a-b629-ab5f6a56c885" xlink:href="cbnk-20260630.xsd#cbnk_RealEstateAcquiredThroughForeclosureMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019e3b80-301d-7d85-a47f-c0c1afddc8ea" xlink:to="loc_cbnk_RealEstateAcquiredThroughForeclosureMeasurementInput_019e3b80-301d-730a-b629-ab5f6a56c885" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/FairValueFinancialInstrumentsCarryingAmountFVandPlacementDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#FairValueFinancialInstrumentsCarryingAmountFVandPlacementDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/FairValueFinancialInstrumentsCarryingAmountFVandPlacementDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3b80-301d-7988-a63b-b123ad493c6e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e3b80-301d-7901-8669-30a3ff285626" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3b80-301d-7988-a63b-b123ad493c6e" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e3b80-301d-7901-8669-30a3ff285626" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e3b80-301d-7989-8595-fd46e0e0c159" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e3b80-301d-7901-8669-30a3ff285626" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e3b80-301d-7989-8595-fd46e0e0c159" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-7989-8595-fd46e0e0c159_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e3b80-301d-7989-8595-fd46e0e0c159" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-7989-8595-fd46e0e0c159_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-7bb5-a71d-5d6b52a0b840" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e3b80-301d-7989-8595-fd46e0e0c159" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-7bb5-a71d-5d6b52a0b840" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019e3b80-301d-798f-80a7-1e5564e49ffc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-7bb5-a71d-5d6b52a0b840" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019e3b80-301d-798f-80a7-1e5564e49ffc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019e3b80-301d-7b18-ae61-46defd214a94" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-7bb5-a71d-5d6b52a0b840" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019e3b80-301d-7b18-ae61-46defd214a94" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019e3b80-301d-7cc9-94f2-5709cb264081" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e3b80-301d-7bb5-a71d-5d6b52a0b840" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019e3b80-301d-7cc9-94f2-5709cb264081" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_019e3b80-301d-768b-a597-793d23312357" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e3b80-301d-7901-8669-30a3ff285626" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_019e3b80-301d-768b-a597-793d23312357" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e3b80-301d-768b-a597-793d23312357_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019e3b80-301d-768b-a597-793d23312357" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e3b80-301d-768b-a597-793d23312357_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019e3b80-301d-785b-8b86-9db8d5d274d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019e3b80-301d-768b-a597-793d23312357" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019e3b80-301d-785b-8b86-9db8d5d274d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e3b80-301d-7cb2-b427-a7ef30465d6f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019e3b80-301d-785b-8b86-9db8d5d274d4" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e3b80-301d-7cb2-b427-a7ef30465d6f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019e3b80-301d-7749-a373-2d01842e6109" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e3b80-301d-7cb2-b427-a7ef30465d6f" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019e3b80-301d-7749-a373-2d01842e6109" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019e3b80-301d-7ea5-a830-eba0000172ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e3b80-301d-7cb2-b427-a7ef30465d6f" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019e3b80-301d-7ea5-a830-eba0000172ea" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019e3b80-301d-7f6c-aec5-bfddd300a7e9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3b80-301d-7988-a63b-b123ad493c6e" xlink:to="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019e3b80-301d-7f6c-aec5-bfddd300a7e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndDueFromBanks_019e3b80-301d-7a14-894d-6bf3bca5d5a4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndDueFromBanks"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019e3b80-301d-7f6c-aec5-bfddd300a7e9" xlink:to="loc_us-gaap_CashAndDueFromBanks_019e3b80-301d-7a14-894d-6bf3bca5d5a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestBearingDepositsInBanks_019e3b80-301d-7d66-8a61-bdd70417feb0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestBearingDepositsInBanks"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019e3b80-301d-7f6c-aec5-bfddd300a7e9" xlink:to="loc_us-gaap_InterestBearingDepositsInBanks_019e3b80-301d-7d66-8a61-bdd70417feb0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalFundsSold_019e3b80-301d-7e57-a6a7-f10e769357f2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FederalFundsSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019e3b80-301d-7f6c-aec5-bfddd300a7e9" xlink:to="loc_us-gaap_FederalFundsSold_019e3b80-301d-7e57-a6a7-f10e769357f2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedInvestmentIncomeReceivable_019e3b80-301d-78c2-9668-ec098ef68c80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccruedInvestmentIncomeReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019e3b80-301d-7f6c-aec5-bfddd300a7e9" xlink:to="loc_us-gaap_AccruedInvestmentIncomeReceivable_019e3b80-301d-78c2-9668-ec098ef68c80" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableFairValueDisclosure_019e3b80-301d-768c-a696-364ff1c690e2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansReceivableFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019e3b80-301d-7f6c-aec5-bfddd300a7e9" xlink:to="loc_us-gaap_LoansReceivableFairValueDisclosure_019e3b80-301d-768c-a696-364ff1c690e2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedInvestmentsAtFairValue_019e3b80-301d-7c0e-b43b-159aafbee63e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedInvestmentsAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019e3b80-301d-7f6c-aec5-bfddd300a7e9" xlink:to="loc_us-gaap_RestrictedInvestmentsAtFairValue_019e3b80-301d-7c0e-b43b-159aafbee63e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateAcquiredThroughForeclosure_019e3b80-301d-7129-bbb1-4b435dc0f196" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RealEstateAcquiredThroughForeclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019e3b80-301d-7f6c-aec5-bfddd300a7e9" xlink:to="loc_us-gaap_RealEstateAcquiredThroughForeclosure_019e3b80-301d-7129-bbb1-4b435dc0f196" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019e3b80-301d-7827-a1fc-257d6c949f41" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e3b80-301d-7988-a63b-b123ad493c6e" xlink:to="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019e3b80-301d-7827-a1fc-257d6c949f41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_NoninterestBearingDepositLiabilitiesFairValueDisclosure_019e3b80-301d-7650-a9cf-e1ce35963e19" xlink:href="cbnk-20260630.xsd#cbnk_NoninterestBearingDepositLiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019e3b80-301d-7827-a1fc-257d6c949f41" xlink:to="loc_cbnk_NoninterestBearingDepositLiabilitiesFairValueDisclosure_019e3b80-301d-7650-a9cf-e1ce35963e19" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPayableCurrentAndNoncurrent_019e3b80-301d-7a3a-886a-dc73a63908f0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestPayableCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019e3b80-301d-7827-a1fc-257d6c949f41" xlink:to="loc_us-gaap_InterestPayableCurrentAndNoncurrent_019e3b80-301d-7a3a-886a-dc73a63908f0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_InterestBearingDepositLiabilitiesFairValueDisclosure_019e3b80-301d-76c1-a8b8-bdfd180f9147" xlink:href="cbnk-20260630.xsd#cbnk_InterestBearingDepositLiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019e3b80-301d-7827-a1fc-257d6c949f41" xlink:to="loc_cbnk_InterestBearingDepositLiabilitiesFairValueDisclosure_019e3b80-301d-76c1-a8b8-bdfd180f9147" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_LongTermFederalHomeLoanBankAdvancesAndOtherBorrowingsFairValueDisclosure_019e3b80-301d-7eb6-9226-1d74bc6912e1" xlink:href="cbnk-20260630.xsd#cbnk_LongTermFederalHomeLoanBankAdvancesAndOtherBorrowingsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019e3b80-301d-7827-a1fc-257d6c949f41" xlink:to="loc_cbnk_LongTermFederalHomeLoanBankAdvancesAndOtherBorrowingsFairValueDisclosure_019e3b80-301d-7eb6-9226-1d74bc6912e1" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/SegmentsNarrativeDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#SegmentsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/SegmentsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-301d-7189-8c09-e92879ca5914" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e3b80-301d-7043-af7f-84ed1a763195" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-301d-7189-8c09-e92879ca5914" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e3b80-301d-7043-af7f-84ed1a763195" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e3b80-301d-72f2-bbb1-9ba74f25cdd5" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e3b80-301d-7043-af7f-84ed1a763195" xlink:to="loc_dei_LegalEntityAxis_019e3b80-301d-72f2-bbb1-9ba74f25cdd5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e3b80-301d-72f2-bbb1-9ba74f25cdd5_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e3b80-301d-72f2-bbb1-9ba74f25cdd5" xlink:to="loc_dei_EntityDomain_019e3b80-301d-72f2-bbb1-9ba74f25cdd5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e3b80-301d-74ed-841f-12b344871a49" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e3b80-301d-72f2-bbb1-9ba74f25cdd5" xlink:to="loc_dei_EntityDomain_019e3b80-301d-74ed-841f-12b344871a49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_ChurchStreetCapitalMember_019e3b80-301d-76c9-b72b-eaf15726cbdd" xlink:href="cbnk-20260630.xsd#cbnk_ChurchStreetCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e3b80-301d-74ed-841f-12b344871a49" xlink:to="loc_cbnk_ChurchStreetCapitalMember_019e3b80-301d-76c9-b72b-eaf15726cbdd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_019e3b80-301d-7079-a6fd-185c0028b965" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-301d-7189-8c09-e92879ca5914" xlink:to="loc_us-gaap_NumberOfReportableSegments_019e3b80-301d-7079-a6fd-185c0028b965" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019e3b80-301d-75b0-906b-ef0e04ca9755" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-301d-7189-8c09-e92879ca5914" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019e3b80-301d-75b0-906b-ef0e04ca9755" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019e3b80-301d-7e58-a451-82844d3e5eb1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-301d-7189-8c09-e92879ca5914" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019e3b80-301d-7e58-a451-82844d3e5eb1" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/SegmentsScheduleofFinancialInformationbyReportableSegmentDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#SegmentsScheduleofFinancialInformationbyReportableSegmentDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/SegmentsScheduleofFinancialInformationbyReportableSegmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-30d6-7800-b2c3-9a3ddacc9ce1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e3b80-30d6-76b5-ad23-fa750133d3fa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-30d6-7800-b2c3-9a3ddacc9ce1" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e3b80-30d6-76b5-ad23-fa750133d3fa" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e3b80-30d6-76da-ab7f-8ea2411bcf77" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e3b80-30d6-76b5-ad23-fa750133d3fa" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e3b80-30d6-76da-ab7f-8ea2411bcf77" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e3b80-30d6-76da-ab7f-8ea2411bcf77_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e3b80-30d6-76da-ab7f-8ea2411bcf77" xlink:to="loc_us-gaap_SegmentDomain_019e3b80-30d6-76da-ab7f-8ea2411bcf77_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e3b80-30d6-7a8a-9b5a-04e8cccae57e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e3b80-30d6-76da-ab7f-8ea2411bcf77" xlink:to="loc_us-gaap_SegmentDomain_019e3b80-30d6-7a8a-9b5a-04e8cccae57e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_CommercialBankMember_019e3b80-30d6-7a8e-8b45-c0cbd52f3cc9" xlink:href="cbnk-20260630.xsd#cbnk_CommercialBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e3b80-30d6-7a8a-9b5a-04e8cccae57e" xlink:to="loc_cbnk_CommercialBankMember_019e3b80-30d6-7a8e-8b45-c0cbd52f3cc9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OpenSkyMember_019e3b80-30d6-7842-bfca-3771137d4c3f" xlink:href="cbnk-20260630.xsd#cbnk_OpenSkyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e3b80-30d6-7a8a-9b5a-04e8cccae57e" xlink:to="loc_cbnk_OpenSkyMember_019e3b80-30d6-7842-bfca-3771137d4c3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_WindsorAdvantageTMMember_019e3b80-30d6-7d93-a651-d4df6808b23f" xlink:href="cbnk-20260630.xsd#cbnk_WindsorAdvantageTMMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e3b80-30d6-7a8a-9b5a-04e8cccae57e" xlink:to="loc_cbnk_WindsorAdvantageTMMember_019e3b80-30d6-7d93-a651-d4df6808b23f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_CapitalBankHomeLoansMember_019e3b80-30d6-7220-ab7e-be44dfee03fa" xlink:href="cbnk-20260630.xsd#cbnk_CapitalBankHomeLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e3b80-30d6-7a8a-9b5a-04e8cccae57e" xlink:to="loc_cbnk_CapitalBankHomeLoansMember_019e3b80-30d6-7220-ab7e-be44dfee03fa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019e3b80-30d6-7d1b-a64c-6b99e1bad789" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e3b80-30d6-76b5-ad23-fa750133d3fa" xlink:to="loc_srt_ProductOrServiceAxis_019e3b80-30d6-7d1b-a64c-6b99e1bad789" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e3b80-30d6-7d1b-a64c-6b99e1bad789_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019e3b80-30d6-7d1b-a64c-6b99e1bad789" xlink:to="loc_srt_ProductsAndServicesDomain_019e3b80-30d6-7d1b-a64c-6b99e1bad789_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e3b80-30d6-7366-b6f2-3175905904fa" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019e3b80-30d6-7d1b-a64c-6b99e1bad789" xlink:to="loc_srt_ProductsAndServicesDomain_019e3b80-30d6-7366-b6f2-3175905904fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BankServicingMember_019e3b80-30d6-76db-80b9-acfa839967b6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BankServicingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e3b80-30d6-7366-b6f2-3175905904fa" xlink:to="loc_us-gaap_BankServicingMember_019e3b80-30d6-76db-80b9-acfa839967b6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditCardMember_019e3b80-30d6-7edf-b149-51665a92d8a8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditCardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e3b80-30d6-7366-b6f2-3175905904fa" xlink:to="loc_us-gaap_CreditCardMember_019e3b80-30d6-7edf-b149-51665a92d8a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBankingMember_019e3b80-30d6-7382-9ec6-cb95de200b52" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageBankingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e3b80-30d6-7366-b6f2-3175905904fa" xlink:to="loc_us-gaap_MortgageBankingMember_019e3b80-30d6-7382-9ec6-cb95de200b52" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_GovernmentLendingMember_019e3b80-30d6-7505-ae9b-d835626302a6" xlink:href="cbnk-20260630.xsd#cbnk_GovernmentLendingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e3b80-30d6-7366-b6f2-3175905904fa" xlink:to="loc_cbnk_GovernmentLendingMember_019e3b80-30d6-7505-ae9b-d835626302a6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_GovernmentLoanServicingMember_019e3b80-30d6-75d9-8df7-3f24574f6684" xlink:href="cbnk-20260630.xsd#cbnk_GovernmentLoanServicingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e3b80-30d6-7366-b6f2-3175905904fa" xlink:to="loc_cbnk_GovernmentLoanServicingMember_019e3b80-30d6-75d9-8df7-3f24574f6684" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeOperating_019e3b80-30d6-72fe-8122-59202a3a71e2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestAndDividendIncomeOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-30d6-7800-b2c3-9a3ddacc9ce1" xlink:to="loc_us-gaap_InterestAndDividendIncomeOperating_019e3b80-30d6-72fe-8122-59202a3a71e2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseOperating_019e3b80-30d6-7e74-b189-22060fe621d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-30d6-7800-b2c3-9a3ddacc9ce1" xlink:to="loc_us-gaap_InterestExpenseOperating_019e3b80-30d6-7e74-b189-22060fe621d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_019e3b80-30d6-766e-8b1a-3e89eb0d7bf0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-30d6-7800-b2c3-9a3ddacc9ce1" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_019e3b80-30d6-766e-8b1a-3e89eb0d7bf0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal_019e3b80-30d6-72fc-be66-74b6509f52d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-30d6-7800-b2c3-9a3ddacc9ce1" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal_019e3b80-30d6-72fc-be66-74b6509f52d4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_UnfundedCommitmentsCreditLossExpenseReversal_019e3b80-30d6-7503-b980-c4e49ce77679" xlink:href="cbnk-20260630.xsd#cbnk_UnfundedCommitmentsCreditLossExpenseReversal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-30d6-7800-b2c3-9a3ddacc9ce1" xlink:to="loc_cbnk_UnfundedCommitmentsCreditLossExpenseReversal_019e3b80-30d6-7503-b980-c4e49ce77679" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_019e3b80-30d6-73d4-bdb9-e1a40afceaae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-30d6-7800-b2c3-9a3ddacc9ce1" xlink:to="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_019e3b80-30d6-73d4-bdb9-e1a40afceaae" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncomeAbstract_019e3b80-30d6-7633-97e7-60112fac68eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestIncomeAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-30d6-7800-b2c3-9a3ddacc9ce1" xlink:to="loc_us-gaap_NoninterestIncomeAbstract_019e3b80-30d6-7633-97e7-60112fac68eb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_019e3b80-30d6-74f8-83d6-cac598c209b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_019e3b80-30d6-7633-97e7-60112fac68eb" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_019e3b80-30d6-74f8-83d6-cac598c209b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_NoninterestIncomeServicingAsset_019e3b80-30d6-7f29-978a-0e978cb4976e" xlink:href="cbnk-20260630.xsd#cbnk_NoninterestIncomeServicingAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_019e3b80-30d6-7633-97e7-60112fac68eb" xlink:to="loc_cbnk_NoninterestIncomeServicingAsset_019e3b80-30d6-7f29-978a-0e978cb4976e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncomeOtherOperatingIncome_019e3b80-30d6-76bf-906a-85d4ad66b06d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestIncomeOtherOperatingIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_019e3b80-30d6-7633-97e7-60112fac68eb" xlink:to="loc_us-gaap_NoninterestIncomeOtherOperatingIncome_019e3b80-30d6-76bf-906a-85d4ad66b06d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncome_019e3b80-30d6-7ef7-acc8-3f091c574906" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_019e3b80-30d6-7633-97e7-60112fac68eb" xlink:to="loc_us-gaap_NoninterestIncome_019e3b80-30d6-7ef7-acc8-3f091c574906" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpenseAbstract_019e3b80-30d6-782d-aecb-08f6fe11495d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-30d6-7800-b2c3-9a3ddacc9ce1" xlink:to="loc_us-gaap_NoninterestExpenseAbstract_019e3b80-30d6-782d-aecb-08f6fe11495d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_019e3b80-30d6-7da6-9850-586330057a35" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_019e3b80-30d6-782d-aecb-08f6fe11495d" xlink:to="loc_us-gaap_LaborAndRelatedExpense_019e3b80-30d6-7da6-9850-586330057a35" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OccupancyAndEquipmentExpense_019e3b80-30d6-74c7-ae02-6c8f763c5eb9" xlink:href="cbnk-20260630.xsd#cbnk_OccupancyAndEquipmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_019e3b80-30d6-782d-aecb-08f6fe11495d" xlink:to="loc_cbnk_OccupancyAndEquipmentExpense_019e3b80-30d6-74c7-ae02-6c8f763c5eb9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfessionalFees_019e3b80-30d6-7640-8ba9-8a74405358b2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfessionalFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_019e3b80-30d6-782d-aecb-08f6fe11495d" xlink:to="loc_us-gaap_ProfessionalFees_019e3b80-30d6-7640-8ba9-8a74405358b2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InformationTechnologyAndDataProcessing_019e3b80-30d6-7383-b3ac-2a1594cf5173" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InformationTechnologyAndDataProcessing"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_019e3b80-30d6-782d-aecb-08f6fe11495d" xlink:to="loc_us-gaap_InformationTechnologyAndDataProcessing_019e3b80-30d6-7383-b3ac-2a1594cf5173" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdvertisingExpense_019e3b80-30d6-72ea-ad2c-9f479d04a249" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdvertisingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_019e3b80-30d6-782d-aecb-08f6fe11495d" xlink:to="loc_us-gaap_AdvertisingExpense_019e3b80-30d6-72ea-ad2c-9f479d04a249" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanProcessingFee_019e3b80-30d6-7aa5-bf6c-a5b816ef9cee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoanProcessingFee"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_019e3b80-30d6-782d-aecb-08f6fe11495d" xlink:to="loc_us-gaap_LoanProcessingFee_019e3b80-30d6-7aa5-bf6c-a5b816ef9cee" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019e3b80-30d6-7d8b-89ab-116913e1360d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_019e3b80-30d6-782d-aecb-08f6fe11495d" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019e3b80-30d6-7d8b-89ab-116913e1360d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OperationalAndOtherIncomeLoss_019e3b80-30d6-7a83-8be2-e611d53e7b0e" xlink:href="cbnk-20260630.xsd#cbnk_OperationalAndOtherIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_019e3b80-30d6-782d-aecb-08f6fe11495d" xlink:to="loc_cbnk_OperationalAndOtherIncomeLoss_019e3b80-30d6-7a83-8be2-e611d53e7b0e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_RegulatoryAssessmentsExpense_019e3b80-30d6-7d6e-be16-2f4e046b9535" xlink:href="cbnk-20260630.xsd#cbnk_RegulatoryAssessmentsExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_019e3b80-30d6-782d-aecb-08f6fe11495d" xlink:to="loc_cbnk_RegulatoryAssessmentsExpense_019e3b80-30d6-7d6e-be16-2f4e046b9535" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoninterestExpense_019e3b80-30d6-779c-83dc-ff3cf2bbeba7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherNoninterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_019e3b80-30d6-782d-aecb-08f6fe11495d" xlink:to="loc_us-gaap_OtherNoninterestExpense_019e3b80-30d6-779c-83dc-ff3cf2bbeba7" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpense_019e3b80-30d6-7a74-b954-7c89560dee36" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_019e3b80-30d6-782d-aecb-08f6fe11495d" xlink:to="loc_us-gaap_NoninterestExpense_019e3b80-30d6-7a74-b954-7c89560dee36" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019e3b80-30d6-7af0-b46f-3637a9ac22c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-30d6-7800-b2c3-9a3ddacc9ce1" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019e3b80-30d6-7af0-b46f-3637a9ac22c0" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019e3b80-30d6-7814-9bd9-7b4c67e17936" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-30d6-7800-b2c3-9a3ddacc9ce1" xlink:to="loc_us-gaap_Assets_019e3b80-30d6-7814-9bd9-7b4c67e17936" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_RevenueFromContractWithCustomerIncludingAssessedTaxGross_019e3b80-30d6-737f-b065-40d8bf79f265" xlink:href="cbnk-20260630.xsd#cbnk_RevenueFromContractWithCustomerIncludingAssessedTaxGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-30d6-7800-b2c3-9a3ddacc9ce1" xlink:to="loc_cbnk_RevenueFromContractWithCustomerIncludingAssessedTaxGross_019e3b80-30d6-737f-b065-40d8bf79f265" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_RevenueFromContractWithCustomerServicingFees_019e3b80-30d6-7491-b97b-cf74ebd1e2c8" xlink:href="cbnk-20260630.xsd#cbnk_RevenueFromContractWithCustomerServicingFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-30d6-7800-b2c3-9a3ddacc9ce1" xlink:to="loc_cbnk_RevenueFromContractWithCustomerServicingFees_019e3b80-30d6-7491-b97b-cf74ebd1e2c8" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_SegmentReturnOnAssets_019e3b80-30d6-7781-b718-d2cedbb46f93" xlink:href="cbnk-20260630.xsd#cbnk_SegmentReturnOnAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-30d6-7800-b2c3-9a3ddacc9ce1" xlink:to="loc_cbnk_SegmentReturnOnAssets_019e3b80-30d6-7781-b718-d2cedbb46f93" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_SegmentEfficiencyRatio_019e3b80-30d6-729d-ac69-1df0087b1db2" xlink:href="cbnk-20260630.xsd#cbnk_SegmentEfficiencyRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-30d6-7800-b2c3-9a3ddacc9ce1" xlink:to="loc_cbnk_SegmentEfficiencyRatio_019e3b80-30d6-729d-ac69-1df0087b1db2" xlink:type="arc" order="13"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/SegmentsScheduleofFinancialInformationDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#SegmentsScheduleofFinancialInformationDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/SegmentsScheduleofFinancialInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-30d6-7f26-b3a5-5fb1535e2064" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e3b80-30d6-7577-ba32-58f2b653fb9b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-30d6-7f26-b3a5-5fb1535e2064" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e3b80-30d6-7577-ba32-58f2b653fb9b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e3b80-30d6-7d07-9903-d0a418141299" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e3b80-30d6-7577-ba32-58f2b653fb9b" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e3b80-30d6-7d07-9903-d0a418141299" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e3b80-30d6-7d07-9903-d0a418141299_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e3b80-30d6-7d07-9903-d0a418141299" xlink:to="loc_us-gaap_SegmentDomain_019e3b80-30d6-7d07-9903-d0a418141299_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e3b80-30d6-7ede-8e07-79fd32fc9070" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e3b80-30d6-7d07-9903-d0a418141299" xlink:to="loc_us-gaap_SegmentDomain_019e3b80-30d6-7ede-8e07-79fd32fc9070" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_CommercialBankMember_019e3b80-30d6-7a3f-9337-f67b96d31a0e" xlink:href="cbnk-20260630.xsd#cbnk_CommercialBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e3b80-30d6-7ede-8e07-79fd32fc9070" xlink:to="loc_cbnk_CommercialBankMember_019e3b80-30d6-7a3f-9337-f67b96d31a0e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OpenSkyMember_019e3b80-30d6-769b-ae9d-5a0a5b945da0" xlink:href="cbnk-20260630.xsd#cbnk_OpenSkyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e3b80-30d6-7ede-8e07-79fd32fc9070" xlink:to="loc_cbnk_OpenSkyMember_019e3b80-30d6-769b-ae9d-5a0a5b945da0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_WindsorAdvantageTMMember_019e3b80-30d6-7aff-aa40-f6cdadb96413" xlink:href="cbnk-20260630.xsd#cbnk_WindsorAdvantageTMMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e3b80-30d6-7ede-8e07-79fd32fc9070" xlink:to="loc_cbnk_WindsorAdvantageTMMember_019e3b80-30d6-7aff-aa40-f6cdadb96413" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_CapitalBankHomeLoansMember_019e3b80-30d6-76e9-8e13-263c341cbcdd" xlink:href="cbnk-20260630.xsd#cbnk_CapitalBankHomeLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e3b80-30d6-7ede-8e07-79fd32fc9070" xlink:to="loc_cbnk_CapitalBankHomeLoansMember_019e3b80-30d6-76e9-8e13-263c341cbcdd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e3b80-30d6-7886-bcb2-d21eca02c095" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e3b80-30d6-7577-ba32-58f2b653fb9b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e3b80-30d6-7886-bcb2-d21eca02c095" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e3b80-30d6-7886-bcb2-d21eca02c095_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e3b80-30d6-7886-bcb2-d21eca02c095" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e3b80-30d6-7886-bcb2-d21eca02c095_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e3b80-30d6-75c4-b0da-e35a74cdfe70" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e3b80-30d6-7886-bcb2-d21eca02c095" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e3b80-30d6-75c4-b0da-e35a74cdfe70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_CustomerListsAndTradeNamesMember_019e3b80-30d6-77ad-bfde-0f3bfbc45a4d" xlink:href="cbnk-20260630.xsd#cbnk_CustomerListsAndTradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e3b80-30d6-75c4-b0da-e35a74cdfe70" xlink:to="loc_cbnk_CustomerListsAndTradeNamesMember_019e3b80-30d6-77ad-bfde-0f3bfbc45a4d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsAndFederalFundsSold_019e3b80-30d6-7e8b-90dc-07e3388a1bf7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsAndFederalFundsSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-30d6-7f26-b3a5-5fb1535e2064" xlink:to="loc_us-gaap_CashCashEquivalentsAndFederalFundsSold_019e3b80-30d6-7e8b-90dc-07e3388a1bf7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019e3b80-30d6-7f98-a5d0-08a17379d263" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-30d6-7f26-b3a5-5fb1535e2064" xlink:to="loc_us-gaap_Goodwill_019e3b80-30d6-7f98-a5d0-08a17379d263" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019e3b80-30d6-7d51-954e-279a9b8cf5d3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-30d6-7f26-b3a5-5fb1535e2064" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019e3b80-30d6-7d51-954e-279a9b8cf5d3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OtherSegmentAssets_019e3b80-30d6-7666-b17f-f688296236e7" xlink:href="cbnk-20260630.xsd#cbnk_OtherSegmentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-30d6-7f26-b3a5-5fb1535e2064" xlink:to="loc_cbnk_OtherSegmentAssets_019e3b80-30d6-7666-b17f-f688296236e7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019e3b80-30d6-7dc8-a78f-77465e96c8b2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e3b80-30d6-7f26-b3a5-5fb1535e2064" xlink:to="loc_us-gaap_Assets_019e3b80-30d6-7dc8-a78f-77465e96c8b2" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/EarningsPerShareDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#EarningsPerShareDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/EarningsPerShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019fd1a7-d97c-7ff2-8c81-b2543b084454" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019fd1a7-d97c-7a5d-aa2e-62e75250cdf5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019fd1a7-d97c-7ff2-8c81-b2543b084454" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019fd1a7-d97c-7a5d-aa2e-62e75250cdf5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019fd1a7-d97c-70e8-978f-b3801ee4d4d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019fd1a7-d97c-7a5d-aa2e-62e75250cdf5" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019fd1a7-d97c-70e8-978f-b3801ee4d4d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019fd1a7-d97c-70e8-978f-b3801ee4d4d4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019fd1a7-d97c-70e8-978f-b3801ee4d4d4" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019fd1a7-d97c-70e8-978f-b3801ee4d4d4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019fd1a7-d97c-71d8-887e-36a25cf772aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019fd1a7-d97c-70e8-978f-b3801ee4d4d4" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019fd1a7-d97c-71d8-887e-36a25cf772aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_019fd21b-468b-7295-b0df-1654daddac77" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019fd1a7-d97c-71d8-887e-36a25cf772aa" xlink:to="loc_us-gaap_EmployeeStockOptionMember_019fd21b-468b-7295-b0df-1654daddac77" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019fd1a7-d97c-7e85-a1f2-c78534c962d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019fd1a7-d97c-7ff2-8c81-b2543b084454" xlink:to="loc_us-gaap_NetIncomeLoss_019fd1a7-d97c-7e85-a1f2-c78534c962d0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019fd1a7-d97c-756a-9667-610ea9553c40" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019fd1a7-d97c-7ff2-8c81-b2543b084454" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019fd1a7-d97c-756a-9667-610ea9553c40" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_019fd1a7-d97c-7881-8a73-1e1a07bc3946" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019fd1a7-d97c-7ff2-8c81-b2543b084454" xlink:to="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_019fd1a7-d97c-7881-8a73-1e1a07bc3946" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019fd1a7-d97c-798d-8d26-c31e9b8f2b85" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019fd1a7-d97c-7ff2-8c81-b2543b084454" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019fd1a7-d97c-798d-8d26-c31e9b8f2b85" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_019fd1a7-d97c-7026-b981-5c650eac41c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019fd1a7-d97c-7ff2-8c81-b2543b084454" xlink:to="loc_us-gaap_EarningsPerShareBasic_019fd1a7-d97c-7026-b981-5c650eac41c2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_019fd1a7-d97c-7c9a-94dd-5811298180cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019fd1a7-d97c-7ff2-8c81-b2543b084454" xlink:to="loc_us-gaap_EarningsPerShareDiluted_019fd1a7-d97c-7c9a-94dd-5811298180cd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019fd1a7-d97c-70e3-aa3d-429385e3f465" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019fd1a7-d97c-7ff2-8c81-b2543b084454" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019fd1a7-d97c-70e3-aa3d-429385e3f465" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/SubsequentEventsDetails" xlink:type="simple" xlink:href="cbnk-20260630.xsd#SubsequentEventsDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/SubsequentEventsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_019e95a3-f5e5-78c5-951d-2aaa77480e22" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_019e95a3-f5e5-74d4-a1ba-4127d79d29a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_019e95a3-f5e5-78c5-951d-2aaa77480e22" xlink:to="loc_us-gaap_SubsequentEventTable_019e95a3-f5e5-74d4-a1ba-4127d79d29a5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019e95a3-f5e5-7609-bd3e-bf5d80799ee6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_019e95a3-f5e5-74d4-a1ba-4127d79d29a5" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019e95a3-f5e5-7609-bd3e-bf5d80799ee6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019e95a3-f5e5-7609-bd3e-bf5d80799ee6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019e95a3-f5e5-7609-bd3e-bf5d80799ee6" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019e95a3-f5e5-7609-bd3e-bf5d80799ee6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019e95a3-f5e5-728c-96ad-ad543f85b74c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019e95a3-f5e5-7609-bd3e-bf5d80799ee6" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019e95a3-f5e5-728c-96ad-ad543f85b74c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019e95a4-1fdf-7856-bd09-7144971656cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019e95a3-f5e5-728c-96ad-ad543f85b74c" xlink:to="loc_us-gaap_SubsequentEventMember_019e95a4-1fdf-7856-bd09-7144971656cd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermAxis_019fd1b9-e286-710e-8f7e-c178b092d018" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LeaseContractualTermAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_019e95a3-f5e5-74d4-a1ba-4127d79d29a5" xlink:to="loc_us-gaap_LeaseContractualTermAxis_019fd1b9-e286-710e-8f7e-c178b092d018" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_019fd1b9-e286-710e-8f7e-c178b092d018_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LeaseContractualTermAxis_019fd1b9-e286-710e-8f7e-c178b092d018" xlink:to="loc_us-gaap_LeaseContractualTermDomain_019fd1b9-e286-710e-8f7e-c178b092d018_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_019fd1b9-e286-71b8-9399-18f7b861c817" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LeaseContractualTermAxis_019fd1b9-e286-710e-8f7e-c178b092d018" xlink:to="loc_us-gaap_LeaseContractualTermDomain_019fd1b9-e286-71b8-9399-18f7b861c817" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_LeaseContractualTermAnnapolisMarylandMember_019fd1b9-e286-7b06-a681-cb1c447c4bdb" xlink:href="cbnk-20260630.xsd#cbnk_LeaseContractualTermAnnapolisMarylandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_019fd1b9-e286-71b8-9399-18f7b861c817" xlink:to="loc_cbnk_LeaseContractualTermAnnapolisMarylandMember_019fd1b9-e286-7b06-a681-cb1c447c4bdb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_LeaseContractualTermTowsonMarylandMember_019fd1b9-e286-717c-91fb-fad8e4db290a" xlink:href="cbnk-20260630.xsd#cbnk_LeaseContractualTermTowsonMarylandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_019fd1b9-e286-71b8-9399-18f7b861c817" xlink:to="loc_cbnk_LeaseContractualTermTowsonMarylandMember_019fd1b9-e286-717c-91fb-fad8e4db290a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_019fd219-265f-7287-850e-4685d752551b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_019e95a3-f5e5-74d4-a1ba-4127d79d29a5" xlink:to="loc_srt_StatementScenarioAxis_019fd219-265f-7287-850e-4685d752551b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019fd219-265f-7287-850e-4685d752551b_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_019fd219-265f-7287-850e-4685d752551b" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019fd219-265f-7287-850e-4685d752551b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019fd219-265f-794f-8a5b-006cacb7afcb" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_019fd219-265f-7287-850e-4685d752551b" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019fd219-265f-794f-8a5b-006cacb7afcb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_019fd219-3257-7eaf-b0ba-1a871bd2531f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_019fd219-265f-794f-8a5b-006cacb7afcb" xlink:to="loc_srt_ScenarioForecastMember_019fd219-3257-7eaf-b0ba-1a871bd2531f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseTermOfContract_019fd218-8755-75eb-bdcc-953836a28402" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019e95a3-f5e5-78c5-951d-2aaa77480e22" xlink:to="loc_us-gaap_LesseeOperatingLeaseTermOfContract_019fd218-8755-75eb-bdcc-953836a28402" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1_019fd1b9-e286-7e75-a906-4040f6c5c2fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019e95a3-f5e5-78c5-951d-2aaa77480e22" xlink:to="loc_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1_019fd1b9-e286-7e75-a906-4040f6c5c2fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_019e95a3-f5e5-79d9-ae2f-ac56772ad990" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockDividendsPerShareDeclared"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019e95a3-f5e5-78c5-951d-2aaa77480e22" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_019e95a3-f5e5-79d9-ae2f-ac56772ad990" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_CommonStockDividendsQuarterlyIncreasePercentage_019f208b-dddb-7dcb-bb94-4dae39f82e51" xlink:href="cbnk-20260630.xsd#cbnk_CommonStockDividendsQuarterlyIncreasePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019e95a3-f5e5-78c5-951d-2aaa77480e22" xlink:to="loc_cbnk_CommonStockDividendsQuarterlyIncreasePercentage_019f208b-dddb-7dcb-bb94-4dae39f82e51" xlink:type="arc" order="3"/>
  </link:definitionLink>
</link:linkbase>
