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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019cbfed-6511-73d0-960c-925f4c9f05cb,g:7d10fd2b-653e-4a90-bc91-72c8957667db-->
<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://www.seacoastbanking.com/role/CONSOLIDATEDSTATEMENTSOFCONVERTIBLEPREFERREDSTOCKANDSHAREHOLDERSEQUITYUnaudited" xlink:type="simple" xlink:href="sbcf-20260331.xsd#CONSOLIDATEDSTATEMENTSOFCONVERTIBLEPREFERREDSTOCKANDSHAREHOLDERSEQUITYUnaudited"/>
  <link:definitionLink xlink:role="http://www.seacoastbanking.com/role/CONSOLIDATEDSTATEMENTSOFCONVERTIBLEPREFERREDSTOCKANDSHAREHOLDERSEQUITYUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019cbfed-68ff-7adc-86e3-55a1f130c4f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019cbfed-68ff-77d0-823c-77216db2c443" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019cbfed-68ff-7adc-86e3-55a1f130c4f3" xlink:to="loc_us-gaap_StatementTable_019cbfed-68ff-77d0-823c-77216db2c443" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019cbfed-68ff-79fa-9398-c195887eba84" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019cbfed-68ff-77d0-823c-77216db2c443" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019cbfed-68ff-79fa-9398-c195887eba84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019cbfed-68ff-79fa-9398-c195887eba84_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019cbfed-68ff-79fa-9398-c195887eba84" xlink:to="loc_us-gaap_EquityComponentDomain_019cbfed-68ff-79fa-9398-c195887eba84_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019cbfed-68ff-777c-8b9d-1f66801f729b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019cbfed-68ff-79fa-9398-c195887eba84" xlink:to="loc_us-gaap_EquityComponentDomain_019cbfed-68ff-777c-8b9d-1f66801f729b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019cbfed-68ff-7e5d-9112-7d111b6022d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019cbfed-68ff-777c-8b9d-1f66801f729b" xlink:to="loc_us-gaap_CommonStockMember_019cbfed-68ff-7e5d-9112-7d111b6022d1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019cbfed-68ff-7faa-8e2c-01260683e65e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019cbfed-68ff-777c-8b9d-1f66801f729b" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019cbfed-68ff-7faa-8e2c-01260683e65e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019cbfed-68ff-7ed5-8039-0e3e1b66c65f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019cbfed-68ff-777c-8b9d-1f66801f729b" xlink:to="loc_us-gaap_RetainedEarningsMember_019cbfed-68ff-7ed5-8039-0e3e1b66c65f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_019cbfed-68ff-77d5-b7d1-68df2b2613aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019cbfed-68ff-777c-8b9d-1f66801f729b" xlink:to="loc_us-gaap_TreasuryStockCommonMember_019cbfed-68ff-77d5-b7d1-68df2b2613aa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019cbfed-68ff-73e1-8def-25149db35689" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019cbfed-68ff-777c-8b9d-1f66801f729b" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019cbfed-68ff-73e1-8def-25149db35689" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_019cfb84-6c7e-7cb1-a971-db44ebb05861" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInTemporaryEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019cbfed-68ff-7adc-86e3-55a1f130c4f3" xlink:to="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_019cfb84-6c7e-7cb1-a971-db44ebb05861" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquitySharesOutstanding_019cfb7e-2e00-7569-8a4a-0cd3b2e1ec69" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TemporaryEquitySharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_019cfb84-6c7e-7cb1-a971-db44ebb05861" xlink:to="loc_us-gaap_TemporaryEquitySharesOutstanding_019cfb7e-2e00-7569-8a4a-0cd3b2e1ec69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_019cfb7e-2e00-7bd8-8e6c-decaa312e9b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TemporaryEquityCarryingAmountAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_019cfb84-6c7e-7cb1-a971-db44ebb05861" xlink:to="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_019cfb7e-2e00-7bd8-8e6c-decaa312e9b9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquitySharesOutstanding_019cfb83-7f4e-7df8-a590-7048df336799" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TemporaryEquitySharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_019cfb83-9bc7-79f5-be58-a3749da55eef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TemporaryEquityCarryingAmountAttributableToParent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfb84-df4c-761d-a2f9-5a6aa6da1059" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019cbfed-68ff-7adc-86e3-55a1f130c4f3" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfb84-df4c-761d-a2f9-5a6aa6da1059" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019cbfed-68ff-7c4e-b740-4bf9dec891f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfb84-df4c-761d-a2f9-5a6aa6da1059" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019cbfed-68ff-7c4e-b740-4bf9dec891f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019cbfed-68ff-77a9-b16c-ead69b215803" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfb84-df4c-761d-a2f9-5a6aa6da1059" xlink:to="loc_us-gaap_StockholdersEquity_019cbfed-68ff-77a9-b16c-ead69b215803" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_019cbfed-68ff-7b1d-b798-4588aa076ab3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfb84-df4c-761d-a2f9-5a6aa6da1059" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_019cbfed-68ff-7b1d-b798-4588aa076ab3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019cbfed-68ff-71ff-b65e-59c90d71ea95" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfb84-df4c-761d-a2f9-5a6aa6da1059" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019cbfed-68ff-71ff-b65e-59c90d71ea95" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan_019cbfed-68ff-7e9a-9638-ed3bb8a48f9b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfb84-df4c-761d-a2f9-5a6aa6da1059" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan_019cbfed-68ff-7e9a-9638-ed3bb8a48f9b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan_019cbfed-68ff-75e0-a452-21f7fde95b0b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfb84-df4c-761d-a2f9-5a6aa6da1059" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan_019cbfed-68ff-75e0-a452-21f7fde95b0b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_019d9b91-e471-7235-a093-9e1a037a44bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfb84-df4c-761d-a2f9-5a6aa6da1059" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_019d9b91-e471-7235-a093-9e1a037a44bd" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_019cfb86-0d9e-771f-9139-335841201fc7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfb84-df4c-761d-a2f9-5a6aa6da1059" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_019cfb86-0d9e-771f-9139-335841201fc7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStock_019cbfed-68ff-791f-8043-36f7c1f212c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfb84-df4c-761d-a2f9-5a6aa6da1059" xlink:to="loc_us-gaap_DividendsCommonStock_019cbfed-68ff-791f-8043-36f7c1f212c3" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPreferredStock_019d728c-91ab-74ed-9e86-20b861e8765d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsPreferredStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfb84-df4c-761d-a2f9-5a6aa6da1059" xlink:to="loc_us-gaap_DividendsPreferredStock_019d728c-91ab-74ed-9e86-20b861e8765d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesPeriodIncreaseDecrease_019cbfed-68ff-72fa-84f0-2f933bac1459" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesPeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfb84-df4c-761d-a2f9-5a6aa6da1059" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesPeriodIncreaseDecrease_019cbfed-68ff-72fa-84f0-2f933bac1459" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityPeriodIncreaseDecrease_019cbfed-68ff-77ea-882a-ceb5a131dba4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityPeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cfb84-df4c-761d-a2f9-5a6aa6da1059" xlink:to="loc_us-gaap_StockholdersEquityPeriodIncreaseDecrease_019cbfed-68ff-77ea-882a-ceb5a131dba4" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019cbfed-68ff-76ec-aea7-1d4430aba66e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019cbfed-68ff-71e0-8b67-da1d38659358" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/SecuritiesScheduleofAmortizedCostandFairValueofSecuritiesAvailableforSaleandHeldforInvestmentDetails" xlink:type="simple" xlink:href="sbcf-20260331.xsd#SecuritiesScheduleofAmortizedCostandFairValueofSecuritiesAvailableforSaleandHeldforInvestmentDetails"/>
  <link:definitionLink xlink:role="http://www.seacoastbanking.com/role/SecuritiesScheduleofAmortizedCostandFairValueofSecuritiesAvailableforSaleandHeldforInvestmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cbfed-68ff-731c-a07a-8fc950f29251" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019cbfed-68ff-7197-8053-54af2fe97bf7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cbfed-68ff-731c-a07a-8fc950f29251" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019cbfed-68ff-7197-8053-54af2fe97bf7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019cbfed-68ff-7fb6-9484-83c395b9c650" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019cbfed-68ff-7197-8053-54af2fe97bf7" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019cbfed-68ff-7fb6-9484-83c395b9c650" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-7fb6-9484-83c395b9c650_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cbfed-68ff-7fb6-9484-83c395b9c650" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-7fb6-9484-83c395b9c650_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-7403-81dd-e26befbac4b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cbfed-68ff-7fb6-9484-83c395b9c650" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-7403-81dd-e26befbac4b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_019cbfed-68ff-7acf-87ff-263bf69a297d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USTreasuryAndGovernmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-7403-81dd-e26befbac4b1" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_019cbfed-68ff-7acf-87ff-263bf69a297d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019cbfed-68ff-7d7f-9cd1-49c880bbf605" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-7403-81dd-e26befbac4b1" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019cbfed-68ff-7d7f-9cd1-49c880bbf605" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019cbfed-68ff-7aa3-9d7b-eae3865522ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-7403-81dd-e26befbac4b1" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019cbfed-68ff-7aa3-9d7b-eae3865522ff" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_019cbfed-68ff-7b9a-945f-f589e2719231" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-7403-81dd-e26befbac4b1" xlink:to="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_019cbfed-68ff-7b9a-945f-f589e2719231" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralizedLoanObligationsMember_019cbfed-68ff-78a0-9707-362cc1c9ae23" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollateralizedLoanObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-7403-81dd-e26befbac4b1" xlink:to="loc_us-gaap_CollateralizedLoanObligationsMember_019cbfed-68ff-78a0-9707-362cc1c9ae23" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019cbfed-68ff-77a9-ac0e-bc1eeace189c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-7403-81dd-e26befbac4b1" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019cbfed-68ff-77a9-ac0e-bc1eeace189c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherDebtSecuritiesMember_019cbfed-68ff-7c68-bbbc-817fdd9c51de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-7403-81dd-e26befbac4b1" xlink:to="loc_us-gaap_OtherDebtSecuritiesMember_019cbfed-68ff-7c68-bbbc-817fdd9c51de" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract_019cbfed-68ff-7ad3-81fc-3b4557af9d4d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cbfed-68ff-731c-a07a-8fc950f29251" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract_019cbfed-68ff-7ad3-81fc-3b4557af9d4d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_019cbfed-68ff-77f4-b8a3-5e3c81be3fff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract_019cbfed-68ff-7ad3-81fc-3b4557af9d4d" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_019cbfed-68ff-77f4-b8a3-5e3c81be3fff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019cbfed-68ff-7b65-a693-4aa628f6fb09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract_019cbfed-68ff-7ad3-81fc-3b4557af9d4d" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019cbfed-68ff-7b65-a693-4aa628f6fb09" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019cbfed-68ff-7ad4-b058-16570838bd38" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract_019cbfed-68ff-7ad3-81fc-3b4557af9d4d" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019cbfed-68ff-7ad4-b058-16570838bd38" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019cbfed-68ff-7393-b294-a1ff81ba36d7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract_019cbfed-68ff-7ad3-81fc-3b4557af9d4d" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019cbfed-68ff-7393-b294-a1ff81ba36d7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesAbstract_019cbfed-68ff-7b36-9344-9b6727d1018b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cbfed-68ff-731c-a07a-8fc950f29251" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesAbstract_019cbfed-68ff-7b36-9344-9b6727d1018b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss_019cbfed-68ff-7d9b-90fb-efa25eaeda44" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesAbstract_019cbfed-68ff-7b36-9344-9b6727d1018b" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss_019cbfed-68ff-7d9b-90fb-efa25eaeda44" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain_019cbfed-68ff-71cd-b446-59a20f0fccd9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesAbstract_019cbfed-68ff-7b36-9344-9b6727d1018b" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain_019cbfed-68ff-71cd-b446-59a20f0fccd9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_019cbfed-68ff-7228-bc3d-697992160919" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesAbstract_019cbfed-68ff-7b36-9344-9b6727d1018b" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_019cbfed-68ff-7228-bc3d-697992160919" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesFairValue_019cbfed-68ff-782b-9881-35186fab763c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesAbstract_019cbfed-68ff-7b36-9344-9b6727d1018b" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesFairValue_019cbfed-68ff-782b-9881-35186fab763c" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/SecuritiesNarrativeDetails" xlink:type="simple" xlink:href="sbcf-20260331.xsd#SecuritiesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.seacoastbanking.com/role/SecuritiesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cbfed-68ff-734d-af35-d8ea953f4218" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019cbfed-68ff-7f1c-9050-af835c9c3649" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cbfed-68ff-734d-af35-d8ea953f4218" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019cbfed-68ff-7f1c-9050-af835c9c3649" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019cbfed-68ff-72a6-a674-d9fd61112ee4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019cbfed-68ff-7f1c-9050-af835c9c3649" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019cbfed-68ff-72a6-a674-d9fd61112ee4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-72a6-a674-d9fd61112ee4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cbfed-68ff-72a6-a674-d9fd61112ee4" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-72a6-a674-d9fd61112ee4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-75ab-80b4-c1172cf58658" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cbfed-68ff-72a6-a674-d9fd61112ee4" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-75ab-80b4-c1172cf58658" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_CRAQualifiedDebtSecuritiesMember_019cbfed-68ff-7f97-b0e6-f098b07c68d9" xlink:href="sbcf-20260331.xsd#sbcf_CRAQualifiedDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-75ab-80b4-c1172cf58658" xlink:to="loc_sbcf_CRAQualifiedDebtSecuritiesMember_019cbfed-68ff-7f97-b0e6-f098b07c68d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_019cbfed-68ff-7422-a8dd-e6f2e0d1365c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USTreasuryAndGovernmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-75ab-80b4-c1172cf58658" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_019cbfed-68ff-7422-a8dd-e6f2e0d1365c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_019cbfed-68ff-7632-9862-7d923cf2a733" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-75ab-80b4-c1172cf58658" xlink:to="loc_us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_019cbfed-68ff-7632-9862-7d923cf2a733" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_019cbfed-68ff-71d5-9487-95e3d1530dd3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-75ab-80b4-c1172cf58658" xlink:to="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_019cbfed-68ff-71d5-9487-95e3d1530dd3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralizedLoanObligationsMember_019cbfed-68ff-7cb6-8860-597314878958" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollateralizedLoanObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-75ab-80b4-c1172cf58658" xlink:to="loc_us-gaap_CollateralizedLoanObligationsMember_019cbfed-68ff-7cb6-8860-597314878958" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019cbfed-68ff-70f1-9c79-5293f474553f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-75ab-80b4-c1172cf58658" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019cbfed-68ff-70f1-9c79-5293f474553f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherDebtSecuritiesMember_019ddc9c-513e-75f5-9350-f888167d7930" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-75ab-80b4-c1172cf58658" xlink:to="loc_us-gaap_OtherDebtSecuritiesMember_019ddc9c-513e-75f5-9350-f888167d7930" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusAxis_019cbfed-68ff-709d-aa54-534e32083f21" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgedStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019cbfed-68ff-7f1c-9050-af835c9c3649" xlink:to="loc_us-gaap_PledgedStatusAxis_019cbfed-68ff-709d-aa54-534e32083f21" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusDomain_019cbfed-68ff-709d-aa54-534e32083f21_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PledgedStatusAxis_019cbfed-68ff-709d-aa54-534e32083f21" xlink:to="loc_us-gaap_PledgedStatusDomain_019cbfed-68ff-709d-aa54-534e32083f21_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusDomain_019cbfed-68ff-7ca5-8d6e-b33265746b53" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PledgedStatusAxis_019cbfed-68ff-709d-aa54-534e32083f21" xlink:to="loc_us-gaap_PledgedStatusDomain_019cbfed-68ff-7ca5-8d6e-b33265746b53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetPledgedAsCollateralMember_019cbfed-68ff-7367-a46e-3b04cda8462a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetPledgedAsCollateralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PledgedStatusDomain_019cbfed-68ff-7ca5-8d6e-b33265746b53" xlink:to="loc_us-gaap_AssetPledgedAsCollateralMember_019cbfed-68ff-7367-a46e-3b04cda8462a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CreditRatingStandardPoorsAxis_019cbfed-68ff-7010-bc8c-b23c898552a6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CreditRatingStandardPoorsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019cbfed-68ff-7f1c-9050-af835c9c3649" xlink:to="loc_srt_CreditRatingStandardPoorsAxis_019cbfed-68ff-7010-bc8c-b23c898552a6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ExternalCreditRatingStandardPoorsMember_019cbfed-68ff-7010-bc8c-b23c898552a6_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ExternalCreditRatingStandardPoorsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CreditRatingStandardPoorsAxis_019cbfed-68ff-7010-bc8c-b23c898552a6" xlink:to="loc_srt_ExternalCreditRatingStandardPoorsMember_019cbfed-68ff-7010-bc8c-b23c898552a6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ExternalCreditRatingStandardPoorsMember_019cbfed-68ff-7e07-a307-02f2de99a042" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ExternalCreditRatingStandardPoorsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CreditRatingStandardPoorsAxis_019cbfed-68ff-7010-bc8c-b23c898552a6" xlink:to="loc_srt_ExternalCreditRatingStandardPoorsMember_019cbfed-68ff-7e07-a307-02f2de99a042" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StandardPoorsAAARatingMember_019cbfed-68ff-77e4-a3e4-bd9c154e605f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StandardPoorsAAARatingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ExternalCreditRatingStandardPoorsMember_019cbfed-68ff-7e07-a307-02f2de99a042" xlink:to="loc_srt_StandardPoorsAAARatingMember_019cbfed-68ff-77e4-a3e4-bd9c154e605f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StandardPoorsAARatingMember_019cbfed-68ff-76e0-94a7-8ed9417c07f4" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StandardPoorsAARatingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ExternalCreditRatingStandardPoorsMember_019cbfed-68ff-7e07-a307-02f2de99a042" xlink:to="loc_srt_StandardPoorsAARatingMember_019cbfed-68ff-76e0-94a7-8ed9417c07f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_ProceedsFromSaleOfDebtSecuritiesAvailableForSaleIncludingLegacySecurities_019cbfed-68ff-7e5e-8000-8d894c42539a" xlink:href="sbcf-20260331.xsd#sbcf_ProceedsFromSaleOfDebtSecuritiesAvailableForSaleIncludingLegacySecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cbfed-68ff-734d-af35-d8ea953f4218" xlink:to="loc_sbcf_ProceedsFromSaleOfDebtSecuritiesAvailableForSaleIncludingLegacySecurities_019cbfed-68ff-7e5e-8000-8d894c42539a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss_019d4ccb-ffce-7514-994b-1d34c8cf6d64" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cbfed-68ff-734d-af35-d8ea953f4218" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss_019d4ccb-ffce-7514-994b-1d34c8cf6d64" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGain_019cbfed-68ff-75cf-8d15-cc5363884a6f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleRealizedGain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cbfed-68ff-734d-af35-d8ea953f4218" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGain_019cbfed-68ff-75cf-8d15-cc5363884a6f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsOwnedAtFairValue_019cbfed-68ff-7108-8a21-5328967a9720" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentsOwnedAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cbfed-68ff-734d-af35-d8ea953f4218" xlink:to="loc_us-gaap_FinancialInstrumentsOwnedAtFairValue_019cbfed-68ff-7108-8a21-5328967a9720" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_019cbfed-68ff-79f4-9a1c-191a7201215b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cbfed-68ff-734d-af35-d8ea953f4218" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_019cbfed-68ff-79f4-9a1c-191a7201215b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_019cbfed-68ff-7ec9-9c81-0f2deb40e24d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cbfed-68ff-734d-af35-d8ea953f4218" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_019cbfed-68ff-7ec9-9c81-0f2deb40e24d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest_019cbfed-68ff-7eee-a2ee-0266b6771b27" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cbfed-68ff-734d-af35-d8ea953f4218" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest_019cbfed-68ff-7eee-a2ee-0266b6771b27" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_DebtSecuritiesAvailableforsaleUnrealizedLossPositionAverageCreditSupport_019cbfed-68ff-795c-b0c2-5bb5ac591da1" xlink:href="sbcf-20260331.xsd#sbcf_DebtSecuritiesAvailableforsaleUnrealizedLossPositionAverageCreditSupport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cbfed-68ff-734d-af35-d8ea953f4218" xlink:to="loc_sbcf_DebtSecuritiesAvailableforsaleUnrealizedLossPositionAverageCreditSupport_019cbfed-68ff-795c-b0c2-5bb5ac591da1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_DebtSecuritiesAvailableforsaleUnrealizedLossPositionNumberofPositionsPercentageOfTotal_019cbfed-68ff-761a-9505-d09b413a6fdb" xlink:href="sbcf-20260331.xsd#sbcf_DebtSecuritiesAvailableforsaleUnrealizedLossPositionNumberofPositionsPercentageOfTotal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cbfed-68ff-734d-af35-d8ea953f4218" xlink:to="loc_sbcf_DebtSecuritiesAvailableforsaleUnrealizedLossPositionNumberofPositionsPercentageOfTotal_019cbfed-68ff-761a-9505-d09b413a6fdb" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest_019cbfed-68ff-7821-b7fa-18e31fa06826" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cbfed-68ff-734d-af35-d8ea953f4218" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest_019cbfed-68ff-7821-b7fa-18e31fa06826" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalHomeLoanBankStockAndFederalReserveBankStock_019cbfed-68ff-729b-b150-44942df15b45" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FederalHomeLoanBankStockAndFederalReserveBankStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cbfed-68ff-734d-af35-d8ea953f4218" xlink:to="loc_us-gaap_FederalHomeLoanBankStockAndFederalReserveBankStock_019cbfed-68ff-729b-b150-44942df15b45" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss_019cbfed-68ff-7f26-9265-f79545a3f0ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cbfed-68ff-734d-af35-d8ea953f4218" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss_019cbfed-68ff-7f26-9265-f79545a3f0ae" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss_019cbfed-68ff-7388-81b3-375463401f86" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cbfed-68ff-734d-af35-d8ea953f4218" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss_019cbfed-68ff-7388-81b3-375463401f86" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNi_019cbfed-68ff-74a4-a8d3-b7d033e11fe7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFvNi"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cbfed-68ff-734d-af35-d8ea953f4218" xlink:to="loc_us-gaap_EquitySecuritiesFvNi_019cbfed-68ff-74a4-a8d3-b7d033e11fe7" xlink:type="arc" order="13"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/SecuritiesScheduleofAmortizedCostandFairValueofSecuritiesbyContractualMaturityDetails" xlink:type="simple" xlink:href="sbcf-20260331.xsd#SecuritiesScheduleofAmortizedCostandFairValueofSecuritiesbyContractualMaturityDetails"/>
  <link:definitionLink xlink:role="http://www.seacoastbanking.com/role/SecuritiesScheduleofAmortizedCostandFairValueofSecuritiesbyContractualMaturityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_019cbfed-68ff-79e6-a587-e93ae0e34c2b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesTable_019cbfed-68ff-70c8-9b11-0a5769563e34" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfHeldToMaturitySecuritiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_019cbfed-68ff-79e6-a587-e93ae0e34c2b" xlink:to="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesTable_019cbfed-68ff-70c8-9b11-0a5769563e34" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019cbfed-68ff-70a4-b319-b15e4e339ef9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesTable_019cbfed-68ff-70c8-9b11-0a5769563e34" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019cbfed-68ff-70a4-b319-b15e4e339ef9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-70a4-b319-b15e4e339ef9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cbfed-68ff-70a4-b319-b15e4e339ef9" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-70a4-b319-b15e4e339ef9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-7ee1-a865-1fb6caa7422d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cbfed-68ff-70a4-b319-b15e4e339ef9" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-7ee1-a865-1fb6caa7422d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019cbfed-68ff-7a65-9878-82f545d8fcd9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-7ee1-a865-1fb6caa7422d" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019cbfed-68ff-7a65-9878-82f545d8fcd9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019cbfed-68ff-79eb-b965-5c8d7891dad5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-7ee1-a865-1fb6caa7422d" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019cbfed-68ff-79eb-b965-5c8d7891dad5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_019cbfed-68ff-7e5b-9139-0773a01b7db1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-7ee1-a865-1fb6caa7422d" xlink:to="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_019cbfed-68ff-7e5b-9139-0773a01b7db1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralizedLoanObligationsMember_019cbfed-68ff-7aba-96fe-87f7c40123fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollateralizedLoanObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-7ee1-a865-1fb6caa7422d" xlink:to="loc_us-gaap_CollateralizedLoanObligationsMember_019cbfed-68ff-7aba-96fe-87f7c40123fc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherDebtSecuritiesMember_019cbfed-68ff-7d39-afcd-474efd792d72" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-7ee1-a865-1fb6caa7422d" xlink:to="loc_us-gaap_OtherDebtSecuritiesMember_019cbfed-68ff-7d39-afcd-474efd792d72" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAbstract_019cbfed-68ff-78e7-a4ea-53d7b4e784ed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_019cbfed-68ff-79e6-a587-e93ae0e34c2b" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAbstract_019cbfed-68ff-78e7-a4ea-53d7b4e784ed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAbstract_019cbfed-68ff-7b98-b539-76157149ad56" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAbstract_019cbfed-68ff-78e7-a4ea-53d7b4e784ed" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAbstract_019cbfed-68ff-7b98-b539-76157149ad56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateYearOne_019cbfed-68ff-7a72-9e11-9fc0dd209996" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateYearOne"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAbstract_019cbfed-68ff-7b98-b539-76157149ad56" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateYearOne_019cbfed-68ff-7a72-9e11-9fc0dd209996" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAfterYearOneThroughFive_019cbfed-68ff-7478-9b54-93375364197e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAfterYearOneThroughFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAbstract_019cbfed-68ff-7b98-b539-76157149ad56" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAfterYearOneThroughFive_019cbfed-68ff-7478-9b54-93375364197e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAfterYear5Through10_019cbfed-68ff-7b15-9de8-ae04ea9fa53d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAfterYear5Through10"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAbstract_019cbfed-68ff-7b98-b539-76157149ad56" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAfterYear5Through10_019cbfed-68ff-7b15-9de8-ae04ea9fa53d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAfterYear10_019cbfed-68ff-7472-9bdc-716984f2f09b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAfterYear10"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAbstract_019cbfed-68ff-7b98-b539-76157149ad56" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAfterYear10_019cbfed-68ff-7472-9bdc-716984f2f09b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDate_019cbfed-68ff-75fc-aeaf-ff67c8ca3e6c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAbstract_019cbfed-68ff-7b98-b539-76157149ad56" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDate_019cbfed-68ff-75fc-aeaf-ff67c8ca3e6c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityWithoutSingleMaturityDate_019cbfed-68ff-7496-ae69-4e050d69cec3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityWithoutSingleMaturityDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAbstract_019cbfed-68ff-7b98-b539-76157149ad56" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityWithoutSingleMaturityDate_019cbfed-68ff-7496-ae69-4e050d69cec3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss_019cbfed-68ff-7a72-9fcf-e3c8c609541a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateAbstract_019cbfed-68ff-7b98-b539-76157149ad56" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss_019cbfed-68ff-7a72-9fcf-e3c8c609541a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValueAbstract_019cbfed-68ff-7883-8160-26bf399629f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAbstract_019cbfed-68ff-78e7-a4ea-53d7b4e784ed" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValueAbstract_019cbfed-68ff-7883-8160-26bf399629f4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue_019cbfed-68ff-7730-8ebb-a2466a93b4f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValueAbstract_019cbfed-68ff-7883-8160-26bf399629f4" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue_019cbfed-68ff-7730-8ebb-a2466a93b4f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_019cbfed-68ff-74ea-ade0-db97661ea0e0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValueAbstract_019cbfed-68ff-7883-8160-26bf399629f4" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_019cbfed-68ff-74ea-ade0-db97661ea0e0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_019cbfed-68ff-7f40-9daa-a292ba91363a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValueAbstract_019cbfed-68ff-7883-8160-26bf399629f4" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_019cbfed-68ff-7f40-9daa-a292ba91363a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue_019cbfed-68ff-7139-a1e8-c16b29f20272" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValueAbstract_019cbfed-68ff-7883-8160-26bf399629f4" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue_019cbfed-68ff-7139-a1e8-c16b29f20272" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue_019cbfed-68ff-7c3c-b936-c53d2dd4e800" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValueAbstract_019cbfed-68ff-7883-8160-26bf399629f4" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue_019cbfed-68ff-7c3c-b936-c53d2dd4e800" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_019cbfed-68ff-731f-993f-a801d4b3e671" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValueAbstract_019cbfed-68ff-7883-8160-26bf399629f4" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_019cbfed-68ff-731f-993f-a801d4b3e671" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesFairValue_019cbfed-68ff-7da9-93a1-2b622021737e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValueAbstract_019cbfed-68ff-7883-8160-26bf399629f4" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesFairValue_019cbfed-68ff-7da9-93a1-2b622021737e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAbstract_019cbfed-68ff-7235-8d7a-e3c56f1a3b62" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_019cbfed-68ff-79e6-a587-e93ae0e34c2b" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAbstract_019cbfed-68ff-7235-8d7a-e3c56f1a3b62" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_019cbfed-68ff-7352-863c-7a4f33cf922a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAbstract_019cbfed-68ff-7235-8d7a-e3c56f1a3b62" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_019cbfed-68ff-7352-863c-7a4f33cf922a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_019cbfed-68ff-7b58-b018-083986819839" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_019cbfed-68ff-7352-863c-7a4f33cf922a" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_019cbfed-68ff-7b58-b018-083986819839" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_019cbfed-68ff-7a51-aeca-e293f92ff4e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_019cbfed-68ff-7352-863c-7a4f33cf922a" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_019cbfed-68ff-7a51-aeca-e293f92ff4e7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_019cbfed-68ff-715a-a8a7-db38c97adc33" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_019cbfed-68ff-7352-863c-7a4f33cf922a" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_019cbfed-68ff-715a-a8a7-db38c97adc33" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis_019cbfed-68ff-79d6-8772-373160140754" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_019cbfed-68ff-7352-863c-7a4f33cf922a" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis_019cbfed-68ff-79d6-8772-373160140754" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_019cbfed-68ff-7010-8fb9-d5fa934dbd43" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_019cbfed-68ff-7352-863c-7a4f33cf922a" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_019cbfed-68ff-7010-8fb9-d5fa934dbd43" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_019cbfed-68ff-7fe7-a548-d22b59e84cc3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_019cbfed-68ff-7352-863c-7a4f33cf922a" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_019cbfed-68ff-7fe7-a548-d22b59e84cc3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_019cbfed-68ff-751a-96b7-da1d20346358" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_019cbfed-68ff-7352-863c-7a4f33cf922a" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_019cbfed-68ff-751a-96b7-da1d20346358" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_019cbfed-68ff-7145-adac-4d8760622cc9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAbstract_019cbfed-68ff-7235-8d7a-e3c56f1a3b62" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_019cbfed-68ff-7145-adac-4d8760622cc9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_019cbfed-68ff-7036-bea0-b46221c9cba2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_019cbfed-68ff-7145-adac-4d8760622cc9" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_019cbfed-68ff-7036-bea0-b46221c9cba2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_019cbfed-68ff-7189-844a-3317046814a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_019cbfed-68ff-7145-adac-4d8760622cc9" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_019cbfed-68ff-7189-844a-3317046814a1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_019cbfed-68ff-7fe0-852d-376e18ec5071" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_019cbfed-68ff-7145-adac-4d8760622cc9" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_019cbfed-68ff-7fe0-852d-376e18ec5071" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_019cbfed-68ff-7376-b2be-1a8ae98b73c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_019cbfed-68ff-7145-adac-4d8760622cc9" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_019cbfed-68ff-7376-b2be-1a8ae98b73c2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_019cbfed-68ff-7a34-aaef-750731e69942" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_019cbfed-68ff-7145-adac-4d8760622cc9" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_019cbfed-68ff-7a34-aaef-750731e69942" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_019cbfed-68ff-73bc-ac51-e93129edfb52" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_019cbfed-68ff-7145-adac-4d8760622cc9" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_019cbfed-68ff-73bc-ac51-e93129edfb52" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019cbfed-68ff-7cf3-aa65-a1ce04c262c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_019cbfed-68ff-7145-adac-4d8760622cc9" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019cbfed-68ff-7cf3-aa65-a1ce04c262c6" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/SecuritiesScheduleofUnrealizedLossandFairValueonInvestmentsDetails" xlink:type="simple" xlink:href="sbcf-20260331.xsd#SecuritiesScheduleofUnrealizedLossandFairValueonInvestmentsDetails"/>
  <link:definitionLink xlink:role="http://www.seacoastbanking.com/role/SecuritiesScheduleofUnrealizedLossandFairValueonInvestmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cbfed-68ff-7e0a-bc6d-ba8c5bddaa70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019cbfed-68ff-7fef-9438-c553e68a6660" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cbfed-68ff-7e0a-bc6d-ba8c5bddaa70" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019cbfed-68ff-7fef-9438-c553e68a6660" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019cbfed-68ff-78a9-ac30-af734cf6c33b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019cbfed-68ff-7fef-9438-c553e68a6660" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019cbfed-68ff-78a9-ac30-af734cf6c33b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-78a9-ac30-af734cf6c33b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cbfed-68ff-78a9-ac30-af734cf6c33b" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-78a9-ac30-af734cf6c33b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-7e42-ac0e-2b97b899087a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cbfed-68ff-78a9-ac30-af734cf6c33b" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-7e42-ac0e-2b97b899087a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_019cbfed-68ff-77c6-a4a0-988a342514b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USTreasuryAndGovernmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-7e42-ac0e-2b97b899087a" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_019cbfed-68ff-77c6-a4a0-988a342514b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019cbfed-68ff-751a-91e4-127806b861a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-7e42-ac0e-2b97b899087a" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019cbfed-68ff-751a-91e4-127806b861a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019cbfed-68ff-7425-8fe6-9848383f63d7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-7e42-ac0e-2b97b899087a" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019cbfed-68ff-7425-8fe6-9848383f63d7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_019cbfed-68ff-7524-8dd7-14b73b7da100" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-7e42-ac0e-2b97b899087a" xlink:to="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_019cbfed-68ff-7524-8dd7-14b73b7da100" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralizedLoanObligationsMember_019cbfed-68ff-77f2-aef7-97a27937c477" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollateralizedLoanObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-7e42-ac0e-2b97b899087a" xlink:to="loc_us-gaap_CollateralizedLoanObligationsMember_019cbfed-68ff-77f2-aef7-97a27937c477" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019cbfed-68ff-7afb-8b83-d008dba114e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-7e42-ac0e-2b97b899087a" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019cbfed-68ff-7afb-8b83-d008dba114e2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherDebtSecuritiesMember_019d21c3-8bd8-766c-bf36-be86f4f6817f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-68ff-7e42-ac0e-2b97b899087a" xlink:to="loc_us-gaap_OtherDebtSecuritiesMember_019d21c3-8bd8-766c-bf36-be86f4f6817f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract_019cbfed-68ff-7c2f-b1d4-eb2d7c28c44a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cbfed-68ff-7e0a-bc6d-ba8c5bddaa70" xlink:to="loc_us-gaap_DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract_019cbfed-68ff-7c2f-b1d4-eb2d7c28c44a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_019cbfed-68ff-7be7-b8b0-3e6f8533556e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract_019cbfed-68ff-7c2f-b1d4-eb2d7c28c44a" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_019cbfed-68ff-7be7-b8b0-3e6f8533556e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_019cbfed-68ff-738f-860b-65573bfe95d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract_019cbfed-68ff-7c2f-b1d4-eb2d7c28c44a" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_019cbfed-68ff-738f-860b-65573bfe95d6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_019cbfed-68ff-775c-9afe-ca3cd97d3bd0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract_019cbfed-68ff-7c2f-b1d4-eb2d7c28c44a" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_019cbfed-68ff-775c-9afe-ca3cd97d3bd0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract_019cbfed-68ff-75aa-9950-68d8a6ab9698" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cbfed-68ff-7e0a-bc6d-ba8c5bddaa70" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract_019cbfed-68ff-75aa-9950-68d8a6ab9698" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_019cbfed-68ff-7576-9bb8-848a0624e21c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract_019cbfed-68ff-75aa-9950-68d8a6ab9698" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_019cbfed-68ff-7576-9bb8-848a0624e21c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_019cbfed-68ff-74ff-9c34-8a6956dcac10" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract_019cbfed-68ff-75aa-9950-68d8a6ab9698" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_019cbfed-68ff-74ff-9c34-8a6956dcac10" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_019cbfed-68ff-7ddb-8e62-73d71584f670" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract_019cbfed-68ff-75aa-9950-68d8a6ab9698" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_019cbfed-68ff-7ddb-8e62-73d71584f670" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions_019cbfed-68ff-7502-b523-4a02b535e947" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cbfed-68ff-7e0a-bc6d-ba8c5bddaa70" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions_019cbfed-68ff-7502-b523-4a02b535e947" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/LoansScheduleofPortfolioLoansPurchasedCreditImpairedLoansandPurchasedUnimpairedLoansDetails" xlink:type="simple" xlink:href="sbcf-20260331.xsd#LoansScheduleofPortfolioLoansPurchasedCreditImpairedLoansandPurchasedUnimpairedLoansDetails"/>
  <link:definitionLink xlink:role="http://www.seacoastbanking.com/role/LoansScheduleofPortfolioLoansPurchasedCreditImpairedLoansandPurchasedUnimpairedLoansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019cbfed-68ff-7724-bceb-504f852c55e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019cbfed-68ff-78dd-9085-82a78ee46530" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019cbfed-68ff-7724-bceb-504f852c55e7" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019cbfed-68ff-78dd-9085-82a78ee46530" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019cbfed-68ff-783d-ad7b-420ff1770318" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019cbfed-68ff-78dd-9085-82a78ee46530" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019cbfed-68ff-783d-ad7b-420ff1770318" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019cbfed-68ff-783d-ad7b-420ff1770318_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019cbfed-68ff-783d-ad7b-420ff1770318" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019cbfed-68ff-783d-ad7b-420ff1770318_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019cbfed-68ff-70aa-98da-d741a0b001a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019cbfed-68ff-783d-ad7b-420ff1770318" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019cbfed-68ff-70aa-98da-d741a0b001a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_PortfolioLoansMember_019cbfed-68ff-7f58-a97c-c66f98592421" xlink:href="sbcf-20260331.xsd#sbcf_PortfolioLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019cbfed-68ff-70aa-98da-d741a0b001a5" xlink:to="loc_sbcf_PortfolioLoansMember_019cbfed-68ff-7f58-a97c-c66f98592421" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditLossStatusAxis_019cbfed-68ff-7e15-8954-d3136aa18bed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditLossStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019cbfed-68ff-78dd-9085-82a78ee46530" xlink:to="loc_us-gaap_CreditLossStatusAxis_019cbfed-68ff-7e15-8954-d3136aa18bed" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditLossStatusDomain_019cbfed-68ff-7e15-8954-d3136aa18bed_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditLossStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditLossStatusAxis_019cbfed-68ff-7e15-8954-d3136aa18bed" xlink:to="loc_us-gaap_CreditLossStatusDomain_019cbfed-68ff-7e15-8954-d3136aa18bed_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditLossStatusDomain_019cbfed-68ff-7b73-ae0e-c0864b62a2f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditLossStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditLossStatusAxis_019cbfed-68ff-7e15-8954-d3136aa18bed" xlink:to="loc_us-gaap_CreditLossStatusDomain_019cbfed-68ff-7b73-ae0e-c0864b62a2f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialAssetAcquiredAndNoCreditDeteriorationMember_019cbfed-68ff-77ca-bf44-444df949b081" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialAssetAcquiredAndNoCreditDeteriorationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditLossStatusDomain_019cbfed-68ff-7b73-ae0e-c0864b62a2f1" xlink:to="loc_us-gaap_FinancialAssetAcquiredAndNoCreditDeteriorationMember_019cbfed-68ff-77ca-bf44-444df949b081" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember_019cbfed-68ff-792f-80a8-55256683cbd1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditLossStatusDomain_019cbfed-68ff-7b73-ae0e-c0864b62a2f1" xlink:to="loc_us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember_019cbfed-68ff-792f-80a8-55256683cbd1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cbfed-68ff-7683-9f9b-2954e472949b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019cbfed-68ff-78dd-9085-82a78ee46530" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cbfed-68ff-7683-9f9b-2954e472949b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7683-9f9b-2954e472949b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cbfed-68ff-7683-9f9b-2954e472949b" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7683-9f9b-2954e472949b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-76fb-b7b4-af6f49a20862" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cbfed-68ff-7683-9f9b-2954e472949b" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-76fb-b7b4-af6f49a20862" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_ConstructionAndLandDevelopmentPortfolioSegmentMember_019cbfed-68ff-74ea-8612-ad1ec39fb293" xlink:href="sbcf-20260331.xsd#sbcf_ConstructionAndLandDevelopmentPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-76fb-b7b4-af6f49a20862" xlink:to="loc_sbcf_ConstructionAndLandDevelopmentPortfolioSegmentMember_019cbfed-68ff-74ea-8612-ad1ec39fb293" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_CommercialRealEstatePortfolioSegmentOwnerOccupiedMember_019cbfed-68ff-75a8-a962-9089357c5c5d" xlink:href="sbcf-20260331.xsd#sbcf_CommercialRealEstatePortfolioSegmentOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-76fb-b7b4-af6f49a20862" xlink:to="loc_sbcf_CommercialRealEstatePortfolioSegmentOwnerOccupiedMember_019cbfed-68ff-75a8-a962-9089357c5c5d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_CommercialRealEstatePortfolioSegmentNonOwnerOccupiedMember_019cbfed-68ff-7ec6-b172-446d60858073" xlink:href="sbcf-20260331.xsd#sbcf_CommercialRealEstatePortfolioSegmentNonOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-76fb-b7b4-af6f49a20862" xlink:to="loc_sbcf_CommercialRealEstatePortfolioSegmentNonOwnerOccupiedMember_019cbfed-68ff-7ec6-b172-446d60858073" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_019cbfed-68ff-7767-a398-31ea17139cfc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-76fb-b7b4-af6f49a20862" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_019cbfed-68ff-7767-a398-31ea17139cfc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_019cbfed-68ff-7910-b804-2740edbd81c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-76fb-b7b4-af6f49a20862" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_019cbfed-68ff-7910-b804-2740edbd81c8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_019cbfed-68ff-747f-b88d-6fdcda50aca6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-76fb-b7b4-af6f49a20862" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_019cbfed-68ff-747f-b88d-6fdcda50aca6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019cbfed-68ff-7c57-96ba-ae19274448e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019cbfed-68ff-7724-bceb-504f852c55e7" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019cbfed-68ff-7c57-96ba-ae19274448e2" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/LoansNarrativeDetails" xlink:type="simple" xlink:href="sbcf-20260331.xsd#LoansNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.seacoastbanking.com/role/LoansNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableModificationsLineItems_019cbfed-68ff-7931-b180-afc0d2d920ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableModificationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_019cbfed-68ff-7131-a6e1-c84cbe334e9d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_019cbfed-68ff-7931-b180-afc0d2d920ea" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_019cbfed-68ff-7131-a6e1-c84cbe334e9d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis_019cbfed-68ff-71cb-967b-34ce355667e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_019cbfed-68ff-7131-a6e1-c84cbe334e9d" xlink:to="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis_019cbfed-68ff-71cb-967b-34ce355667e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseTypeDomain_019cbfed-68ff-71cb-967b-34ce355667e5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsSoldUnderAgreementsToRepurchaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis_019cbfed-68ff-71cb-967b-34ce355667e5" xlink:to="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseTypeDomain_019cbfed-68ff-71cb-967b-34ce355667e5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseTypeDomain_019cbfed-68ff-75c0-8bb8-ac44f8c49a94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsSoldUnderAgreementsToRepurchaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis_019cbfed-68ff-71cb-967b-34ce355667e5" xlink:to="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseTypeDomain_019cbfed-68ff-75c0-8bb8-ac44f8c49a94" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansMember_019cbfed-68ff-7c60-8bcb-5f6e4452765d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseTypeDomain_019cbfed-68ff-75c0-8bb8-ac44f8c49a94" xlink:to="loc_us-gaap_LoansMember_019cbfed-68ff-7c60-8bcb-5f6e4452765d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCostsCurrentAndNoncurrent_019cbfed-68ff-74eb-a03a-db4298174144" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredCostsCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_019cbfed-68ff-7931-b180-afc0d2d920ea" xlink:to="loc_us-gaap_DeferredCostsCurrentAndNoncurrent_019cbfed-68ff-74eb-a03a-db4298174144" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueAdjustment_019cbfed-68ff-78e9-b88d-7466dd19372b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_019cbfed-68ff-7931-b180-afc0d2d920ea" xlink:to="loc_us-gaap_AssetsFairValueAdjustment_019cbfed-68ff-78e9-b88d-7466dd19372b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_FairValueAdjustmentPercent_019cbfed-68ff-7d28-b8d7-8116e84dca8b" xlink:href="sbcf-20260331.xsd#sbcf_FairValueAdjustmentPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_019cbfed-68ff-7931-b180-afc0d2d920ea" xlink:to="loc_sbcf_FairValueAdjustmentPercent_019cbfed-68ff-7d28-b8d7-8116e84dca8b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss_019cbfed-68ff-707e-85ab-4d6a73d5dd7a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_019cbfed-68ff-7931-b180-afc0d2d920ea" xlink:to="loc_us-gaap_FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss_019cbfed-68ff-707e-85ab-4d6a73d5dd7a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_FinancingReceivableNonaccrualNoRelatedAllowanceInterestIncome_019cbfed-68ff-78b5-9027-0d0489432384" xlink:href="sbcf-20260331.xsd#sbcf_FinancingReceivableNonaccrualNoRelatedAllowanceInterestIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_019cbfed-68ff-7931-b180-afc0d2d920ea" xlink:to="loc_sbcf_FinancingReceivableNonaccrualNoRelatedAllowanceInterestIncome_019cbfed-68ff-78b5-9027-0d0489432384" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/LoansScheduleofPastDueFinancingReceivablesDetails" xlink:type="simple" xlink:href="sbcf-20260331.xsd#LoansScheduleofPastDueFinancingReceivablesDetails"/>
  <link:definitionLink xlink:role="http://www.seacoastbanking.com/role/LoansScheduleofPastDueFinancingReceivablesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_019cbfed-68ff-7560-a6ad-3a0ca23e735d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_019cbfed-68ff-7795-8f3b-5264a684b101" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFinancingReceivablesPastDueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_019cbfed-68ff-7560-a6ad-3a0ca23e735d" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_019cbfed-68ff-7795-8f3b-5264a684b101" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019cbfed-68ff-7a77-9c90-b4dc3a7a20ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_019cbfed-68ff-7795-8f3b-5264a684b101" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019cbfed-68ff-7a77-9c90-b4dc3a7a20ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019cbfed-68ff-7a77-9c90-b4dc3a7a20ea_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019cbfed-68ff-7a77-9c90-b4dc3a7a20ea" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019cbfed-68ff-7a77-9c90-b4dc3a7a20ea_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019cbfed-68ff-71f2-9fb2-b305a3a42501" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019cbfed-68ff-7a77-9c90-b4dc3a7a20ea" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019cbfed-68ff-71f2-9fb2-b305a3a42501" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_PortfolioLoansMember_019cbfed-68ff-7845-bcf8-408012a22f9e" xlink:href="sbcf-20260331.xsd#sbcf_PortfolioLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019cbfed-68ff-71f2-9fb2-b305a3a42501" xlink:to="loc_sbcf_PortfolioLoansMember_019cbfed-68ff-7845-bcf8-408012a22f9e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cbfed-68ff-78c0-ab02-ada8db495d86" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_019cbfed-68ff-7795-8f3b-5264a684b101" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cbfed-68ff-78c0-ab02-ada8db495d86" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-78c0-ab02-ada8db495d86_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cbfed-68ff-78c0-ab02-ada8db495d86" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-78c0-ab02-ada8db495d86_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7420-8be3-e52d692c0317" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cbfed-68ff-78c0-ab02-ada8db495d86" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7420-8be3-e52d692c0317" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_ConstructionAndLandDevelopmentPortfolioSegmentMember_019cbfed-68ff-78af-9997-23488518c1bc" xlink:href="sbcf-20260331.xsd#sbcf_ConstructionAndLandDevelopmentPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7420-8be3-e52d692c0317" xlink:to="loc_sbcf_ConstructionAndLandDevelopmentPortfolioSegmentMember_019cbfed-68ff-78af-9997-23488518c1bc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_CommercialRealEstatePortfolioSegmentOwnerOccupiedMember_019cbfed-68ff-7848-96c2-fc0b5ba31ee9" xlink:href="sbcf-20260331.xsd#sbcf_CommercialRealEstatePortfolioSegmentOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7420-8be3-e52d692c0317" xlink:to="loc_sbcf_CommercialRealEstatePortfolioSegmentOwnerOccupiedMember_019cbfed-68ff-7848-96c2-fc0b5ba31ee9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_CommercialRealEstatePortfolioSegmentNonOwnerOccupiedMember_019cbfed-68ff-76be-ab80-ef27fa9cbc63" xlink:href="sbcf-20260331.xsd#sbcf_CommercialRealEstatePortfolioSegmentNonOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7420-8be3-e52d692c0317" xlink:to="loc_sbcf_CommercialRealEstatePortfolioSegmentNonOwnerOccupiedMember_019cbfed-68ff-76be-ab80-ef27fa9cbc63" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_019cbfed-68ff-7092-922c-7d56839bfa43" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7420-8be3-e52d692c0317" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_019cbfed-68ff-7092-922c-7d56839bfa43" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_019cbfed-68ff-703b-8b21-41c9822769ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7420-8be3-e52d692c0317" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_019cbfed-68ff-703b-8b21-41c9822769ec" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_019cbfed-68ff-7b46-8795-e9a76bdce454" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7420-8be3-e52d692c0317" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_019cbfed-68ff-7b46-8795-e9a76bdce454" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019cbfed-68ff-71ec-a63d-c7ef345b5fbb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_019cbfed-68ff-7795-8f3b-5264a684b101" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019cbfed-68ff-71ec-a63d-c7ef345b5fbb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cbfed-68ff-71ec-a63d-c7ef345b5fbb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019cbfed-68ff-71ec-a63d-c7ef345b5fbb" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cbfed-68ff-71ec-a63d-c7ef345b5fbb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cbfed-68ff-7c7d-97ff-b5ba56c84ed6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019cbfed-68ff-71ec-a63d-c7ef345b5fbb" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cbfed-68ff-7c7d-97ff-b5ba56c84ed6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialAssetNotPastDueMember_019cbfed-68ff-7f25-9956-e3bc6fb2ec20" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialAssetNotPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cbfed-68ff-7c7d-97ff-b5ba56c84ed6" xlink:to="loc_us-gaap_FinancialAssetNotPastDueMember_019cbfed-68ff-7f25-9956-e3bc6fb2ec20" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivables30To59DaysPastDueMember_019cbfed-68ff-7119-9425-51398d7f9a40" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivables30To59DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cbfed-68ff-7c7d-97ff-b5ba56c84ed6" xlink:to="loc_us-gaap_FinancingReceivables30To59DaysPastDueMember_019cbfed-68ff-7119-9425-51398d7f9a40" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivables60To89DaysPastDueMember_019cbfed-68ff-7e0b-a893-1a2ed713de75" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivables60To89DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cbfed-68ff-7c7d-97ff-b5ba56c84ed6" xlink:to="loc_us-gaap_FinancingReceivables60To89DaysPastDueMember_019cbfed-68ff-7e0b-a893-1a2ed713de75" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_019cbfed-68ff-7f60-b596-a1a165d320e1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cbfed-68ff-7c7d-97ff-b5ba56c84ed6" xlink:to="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_019cbfed-68ff-7f60-b596-a1a165d320e1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditLossStatusAxis_019cbfed-68ff-7b56-8e0e-1761e435081c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditLossStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_019cbfed-68ff-7795-8f3b-5264a684b101" xlink:to="loc_us-gaap_CreditLossStatusAxis_019cbfed-68ff-7b56-8e0e-1761e435081c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditLossStatusDomain_019cbfed-68ff-7b56-8e0e-1761e435081c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditLossStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditLossStatusAxis_019cbfed-68ff-7b56-8e0e-1761e435081c" xlink:to="loc_us-gaap_CreditLossStatusDomain_019cbfed-68ff-7b56-8e0e-1761e435081c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditLossStatusDomain_019cbfed-68ff-75eb-bfcf-fec3538e9440" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditLossStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditLossStatusAxis_019cbfed-68ff-7b56-8e0e-1761e435081c" xlink:to="loc_us-gaap_CreditLossStatusDomain_019cbfed-68ff-75eb-bfcf-fec3538e9440" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialAssetAcquiredAndNoCreditDeteriorationMember_019cbfed-68ff-7b52-89d3-8d324b99ff4b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialAssetAcquiredAndNoCreditDeteriorationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditLossStatusDomain_019cbfed-68ff-75eb-bfcf-fec3538e9440" xlink:to="loc_us-gaap_FinancialAssetAcquiredAndNoCreditDeteriorationMember_019cbfed-68ff-7b52-89d3-8d324b99ff4b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember_019cbfed-68ff-744e-a047-95c1e57b200a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditLossStatusDomain_019cbfed-68ff-75eb-bfcf-fec3538e9440" xlink:to="loc_us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember_019cbfed-68ff-744e-a047-95c1e57b200a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019cbfed-68ff-7e56-bc19-70392e32686b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_019cbfed-68ff-7560-a6ad-3a0ca23e735d" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019cbfed-68ff-7e56-bc19-70392e32686b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual_019cbfed-68ff-744c-8e00-45b79e263cac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_019cbfed-68ff-7560-a6ad-3a0ca23e735d" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual_019cbfed-68ff-744c-8e00-45b79e263cac" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/LoansScheduleofNonaccrualLoansbyLoanCategoryDetails" xlink:type="simple" xlink:href="sbcf-20260331.xsd#LoansScheduleofNonaccrualLoansbyLoanCategoryDetails"/>
  <link:definitionLink xlink:role="http://www.seacoastbanking.com/role/LoansScheduleofNonaccrualLoansbyLoanCategoryDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableNonaccrualStatusLineItems_019cbfed-68ff-74e2-9d08-1aa55817535b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableNonaccrualStatusLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableNonaccrualTable_019cbfed-68ff-7a05-8613-b095c99f8025" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableNonaccrualTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableNonaccrualStatusLineItems_019cbfed-68ff-74e2-9d08-1aa55817535b" xlink:to="loc_us-gaap_FinancingReceivableNonaccrualTable_019cbfed-68ff-7a05-8613-b095c99f8025" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cbfed-68ff-77c9-8ce0-68820a313fbd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FinancingReceivableNonaccrualTable_019cbfed-68ff-7a05-8613-b095c99f8025" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cbfed-68ff-77c9-8ce0-68820a313fbd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-77c9-8ce0-68820a313fbd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cbfed-68ff-77c9-8ce0-68820a313fbd" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-77c9-8ce0-68820a313fbd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7380-ba0f-c4e7c3828c9e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cbfed-68ff-77c9-8ce0-68820a313fbd" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7380-ba0f-c4e7c3828c9e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_ConstructionAndLandDevelopmentPortfolioSegmentMember_019cbfed-68ff-7e80-9216-b470a3529188" xlink:href="sbcf-20260331.xsd#sbcf_ConstructionAndLandDevelopmentPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7380-ba0f-c4e7c3828c9e" xlink:to="loc_sbcf_ConstructionAndLandDevelopmentPortfolioSegmentMember_019cbfed-68ff-7e80-9216-b470a3529188" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_CommercialRealEstatePortfolioSegmentOwnerOccupiedMember_019cbfed-68ff-7387-914c-6dc5ef6a5aa2" xlink:href="sbcf-20260331.xsd#sbcf_CommercialRealEstatePortfolioSegmentOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7380-ba0f-c4e7c3828c9e" xlink:to="loc_sbcf_CommercialRealEstatePortfolioSegmentOwnerOccupiedMember_019cbfed-68ff-7387-914c-6dc5ef6a5aa2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_CommercialRealEstatePortfolioSegmentNonOwnerOccupiedMember_019cbfed-68ff-7ab1-9372-6102af8966d9" xlink:href="sbcf-20260331.xsd#sbcf_CommercialRealEstatePortfolioSegmentNonOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7380-ba0f-c4e7c3828c9e" xlink:to="loc_sbcf_CommercialRealEstatePortfolioSegmentNonOwnerOccupiedMember_019cbfed-68ff-7ab1-9372-6102af8966d9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_019cbfed-68ff-7f5c-8118-0b52f0b70f02" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7380-ba0f-c4e7c3828c9e" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_019cbfed-68ff-7f5c-8118-0b52f0b70f02" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_019cbfed-68ff-7737-badb-6d68b66d02ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7380-ba0f-c4e7c3828c9e" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_019cbfed-68ff-7737-badb-6d68b66d02ce" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_019cbfed-68ff-7f25-91dc-f48ca52215b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7380-ba0f-c4e7c3828c9e" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_019cbfed-68ff-7f25-91dc-f48ca52215b4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrualNoAllowance_019cbfed-68ff-7897-a011-961551500276" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrualNoAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableNonaccrualStatusLineItems_019cbfed-68ff-74e2-9d08-1aa55817535b" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrualNoAllowance_019cbfed-68ff-7897-a011-961551500276" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_FinancingReceivableExcludingAccruedInterestNonaccrualWithAllowanceForCreditLosses_019cbfed-68ff-78b8-b8bd-1474bc2f3cf6" xlink:href="sbcf-20260331.xsd#sbcf_FinancingReceivableExcludingAccruedInterestNonaccrualWithAllowanceForCreditLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableNonaccrualStatusLineItems_019cbfed-68ff-74e2-9d08-1aa55817535b" xlink:to="loc_sbcf_FinancingReceivableExcludingAccruedInterestNonaccrualWithAllowanceForCreditLosses_019cbfed-68ff-78b8-b8bd-1474bc2f3cf6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual_019cbfed-68ff-78b0-b50b-68f906092a15" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableNonaccrualStatusLineItems_019cbfed-68ff-74e2-9d08-1aa55817535b" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual_019cbfed-68ff-78b0-b50b-68f906092a15" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/LoansScheduleofRiskCategoriesofLoansbyClassofLoansDetails" xlink:type="simple" xlink:href="sbcf-20260331.xsd#LoansScheduleofRiskCategoriesofLoansbyClassofLoansDetails"/>
  <link:definitionLink xlink:role="http://www.seacoastbanking.com/role/LoansScheduleofRiskCategoriesofLoansbyClassofLoansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019cbfed-68ff-751e-9483-7bfc6af5f09d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_019cbfed-68ff-7d58-89b8-33abe1db1131" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019cbfed-68ff-751e-9483-7bfc6af5f09d" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_019cbfed-68ff-7d58-89b8-33abe1db1131" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cbfed-68ff-7968-8a39-33336739c0bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_019cbfed-68ff-7d58-89b8-33abe1db1131" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cbfed-68ff-7968-8a39-33336739c0bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7968-8a39-33336739c0bc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cbfed-68ff-7968-8a39-33336739c0bc" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7968-8a39-33336739c0bc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-74a4-98e9-102963de2f69" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cbfed-68ff-7968-8a39-33336739c0bc" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-74a4-98e9-102963de2f69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_ConstructionAndLandDevelopmentPortfolioSegmentMember_019cbfed-68ff-7209-8832-f65471939b81" xlink:href="sbcf-20260331.xsd#sbcf_ConstructionAndLandDevelopmentPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-74a4-98e9-102963de2f69" xlink:to="loc_sbcf_ConstructionAndLandDevelopmentPortfolioSegmentMember_019cbfed-68ff-7209-8832-f65471939b81" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_CommercialRealEstatePortfolioSegmentOwnerOccupiedMember_019cbfed-68ff-7696-a87a-0649354eb9fc" xlink:href="sbcf-20260331.xsd#sbcf_CommercialRealEstatePortfolioSegmentOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-74a4-98e9-102963de2f69" xlink:to="loc_sbcf_CommercialRealEstatePortfolioSegmentOwnerOccupiedMember_019cbfed-68ff-7696-a87a-0649354eb9fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_CommercialRealEstatePortfolioSegmentNonOwnerOccupiedMember_019cbfed-68ff-7230-810b-61ad525a18b8" xlink:href="sbcf-20260331.xsd#sbcf_CommercialRealEstatePortfolioSegmentNonOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-74a4-98e9-102963de2f69" xlink:to="loc_sbcf_CommercialRealEstatePortfolioSegmentNonOwnerOccupiedMember_019cbfed-68ff-7230-810b-61ad525a18b8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_019cbfed-68ff-79c2-9a9f-35f02cb9e55e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-74a4-98e9-102963de2f69" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_019cbfed-68ff-79c2-9a9f-35f02cb9e55e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_019cbfed-68ff-70dc-9eb9-2cd7b9987d72" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-74a4-98e9-102963de2f69" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_019cbfed-68ff-70dc-9eb9-2cd7b9987d72" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_019cbfed-68ff-76b7-85e5-322f034f86a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-74a4-98e9-102963de2f69" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_019cbfed-68ff-76b7-85e5-322f034f86a2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentAxis_019cbfed-68ff-7b7a-8e04-e507574b9972" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InternalCreditAssessmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_019cbfed-68ff-7d58-89b8-33abe1db1131" xlink:to="loc_us-gaap_InternalCreditAssessmentAxis_019cbfed-68ff-7b7a-8e04-e507574b9972" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentDomain_019cbfed-68ff-7b7a-8e04-e507574b9972_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InternalCreditAssessmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InternalCreditAssessmentAxis_019cbfed-68ff-7b7a-8e04-e507574b9972" xlink:to="loc_us-gaap_InternalCreditAssessmentDomain_019cbfed-68ff-7b7a-8e04-e507574b9972_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentDomain_019cbfed-68ff-7f1f-a35c-5737b8f17217" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InternalCreditAssessmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InternalCreditAssessmentAxis_019cbfed-68ff-7b7a-8e04-e507574b9972" xlink:to="loc_us-gaap_InternalCreditAssessmentDomain_019cbfed-68ff-7f1f-a35c-5737b8f17217" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PassMember_019cbfed-68ff-75bd-951e-24775613f7fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PassMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_019cbfed-68ff-7f1f-a35c-5737b8f17217" xlink:to="loc_us-gaap_PassMember_019cbfed-68ff-75bd-951e-24775613f7fe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SpecialMentionMember_019cbfed-68ff-71c6-944d-217def0b4177" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SpecialMentionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_019cbfed-68ff-7f1f-a35c-5737b8f17217" xlink:to="loc_us-gaap_SpecialMentionMember_019cbfed-68ff-71c6-944d-217def0b4177" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubstandardMember_019cbfed-68ff-7150-b896-3906715a2c5f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubstandardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_019cbfed-68ff-7f1f-a35c-5737b8f17217" xlink:to="loc_us-gaap_SubstandardMember_019cbfed-68ff-7150-b896-3906715a2c5f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DoubtfulMember_019cbfed-68ff-7c16-83c8-26d4bf9e9457" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DoubtfulMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_019cbfed-68ff-7f1f-a35c-5737b8f17217" xlink:to="loc_us-gaap_DoubtfulMember_019cbfed-68ff-7c16-83c8-26d4bf9e9457" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_019cbfed-68ff-735b-9528-c21bb5ec1d29" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019cbfed-68ff-751e-9483-7bfc6af5f09d" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_019cbfed-68ff-735b-9528-c21bb5ec1d29" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_019cbfed-68ff-7cd2-901b-b47ffdb45182" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019cbfed-68ff-751e-9483-7bfc6af5f09d" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_019cbfed-68ff-7cd2-901b-b47ffdb45182" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_019cbfed-68ff-78a5-acf3-dbfe7268e62b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019cbfed-68ff-751e-9483-7bfc6af5f09d" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_019cbfed-68ff-78a5-acf3-dbfe7268e62b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_019cbfed-68ff-72b1-921b-97c458f8f563" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019cbfed-68ff-751e-9483-7bfc6af5f09d" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_019cbfed-68ff-72b1-921b-97c458f8f563" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_019cbfed-68ff-73af-b8dc-45e2a6811f34" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019cbfed-68ff-751e-9483-7bfc6af5f09d" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_019cbfed-68ff-73af-b8dc-45e2a6811f34" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_019cbfed-68ff-707a-a2f3-2230b33c64c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019cbfed-68ff-751e-9483-7bfc6af5f09d" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_019cbfed-68ff-707a-a2f3-2230b33c64c8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolving_019cbfed-68ff-7466-8e13-c8e90bce536b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestRevolving"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019cbfed-68ff-751e-9483-7bfc6af5f09d" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolving_019cbfed-68ff-7466-8e13-c8e90bce536b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoan_019cfc0a-9b2e-73eb-a9da-cc77ee8f6826" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019cbfed-68ff-751e-9483-7bfc6af5f09d" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoan_019cfc0a-9b2e-73eb-a9da-cc77ee8f6826" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019cbfed-68ff-7966-a134-b3219e4fc85b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019cbfed-68ff-751e-9483-7bfc6af5f09d" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019cbfed-68ff-7966-a134-b3219e4fc85b" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff_019cbfed-68ff-7039-8f71-de4723ab368b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019cbfed-68ff-751e-9483-7bfc6af5f09d" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff_019cbfed-68ff-7039-8f71-de4723ab368b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff_019cbfed-68ff-7c9b-a6db-8307b0ff22bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019cbfed-68ff-751e-9483-7bfc6af5f09d" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff_019cbfed-68ff-7c9b-a6db-8307b0ff22bb" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff_019cbfed-68ff-7a48-ba36-b6fbd09bd10b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019cbfed-68ff-751e-9483-7bfc6af5f09d" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff_019cbfed-68ff-7a48-ba36-b6fbd09bd10b" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff_019cbfed-68ff-758c-92ba-9b8875758703" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019cbfed-68ff-751e-9483-7bfc6af5f09d" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff_019cbfed-68ff-758c-92ba-9b8875758703" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff_019cbfed-68ff-7225-8d3e-b886e1f8f831" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019cbfed-68ff-751e-9483-7bfc6af5f09d" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff_019cbfed-68ff-7225-8d3e-b886e1f8f831" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff_019cbfed-68ff-7e2d-aabd-a5fe4c9553cb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019cbfed-68ff-751e-9483-7bfc6af5f09d" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff_019cbfed-68ff-7e2d-aabd-a5fe4c9553cb" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff_019cbfed-68ff-7fd3-a4bb-4570540dd67d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019cbfed-68ff-751e-9483-7bfc6af5f09d" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff_019cbfed-68ff-7fd3-a4bb-4570540dd67d" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoanWriteoff_019cfc0a-9b2e-76f7-a743-ad02e1ab3f4d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoanWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019cbfed-68ff-751e-9483-7bfc6af5f09d" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoanWriteoff_019cfc0a-9b2e-76f7-a743-ad02e1ab3f4d" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019cbfed-68ff-7244-acff-74307e0fd6ed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019cbfed-68ff-751e-9483-7bfc6af5f09d" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019cbfed-68ff-7244-acff-74307e0fd6ed" xlink:type="arc" order="17"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/LoansScheduleofTroubledBorrowerModificationsDetails" xlink:type="simple" xlink:href="sbcf-20260331.xsd#LoansScheduleofTroubledBorrowerModificationsDetails"/>
  <link:definitionLink xlink:role="http://www.seacoastbanking.com/role/LoansScheduleofTroubledBorrowerModificationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableModificationsLineItems_019cbfed-68ff-7787-8095-3016fc53753b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableModificationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_019cbfed-68ff-7c1f-98e7-d48ce4955473" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_019cbfed-68ff-7787-8095-3016fc53753b" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_019cbfed-68ff-7c1f-98e7-d48ce4955473" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cbfed-68ff-70e9-b093-6cbfb35bfa5a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_019cbfed-68ff-7c1f-98e7-d48ce4955473" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cbfed-68ff-70e9-b093-6cbfb35bfa5a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-70e9-b093-6cbfb35bfa5a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cbfed-68ff-70e9-b093-6cbfb35bfa5a" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-70e9-b093-6cbfb35bfa5a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7fea-82c2-aea7e123cfa5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cbfed-68ff-70e9-b093-6cbfb35bfa5a" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7fea-82c2-aea7e123cfa5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_ConstructionAndLandDevelopmentPortfolioSegmentMember_019cbfed-68ff-7c13-aceb-780292d30d8b" xlink:href="sbcf-20260331.xsd#sbcf_ConstructionAndLandDevelopmentPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7fea-82c2-aea7e123cfa5" xlink:to="loc_sbcf_ConstructionAndLandDevelopmentPortfolioSegmentMember_019cbfed-68ff-7c13-aceb-780292d30d8b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_CommercialRealEstatePortfolioSegmentOwnerOccupiedMember_019cbfed-68ff-76ed-a28d-dc75c6ebcfb0" xlink:href="sbcf-20260331.xsd#sbcf_CommercialRealEstatePortfolioSegmentOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7fea-82c2-aea7e123cfa5" xlink:to="loc_sbcf_CommercialRealEstatePortfolioSegmentOwnerOccupiedMember_019cbfed-68ff-76ed-a28d-dc75c6ebcfb0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_CommercialRealEstatePortfolioSegmentNonOwnerOccupiedMember_019cbfed-68ff-7cc5-b7ed-e53efab4753f" xlink:href="sbcf-20260331.xsd#sbcf_CommercialRealEstatePortfolioSegmentNonOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7fea-82c2-aea7e123cfa5" xlink:to="loc_sbcf_CommercialRealEstatePortfolioSegmentNonOwnerOccupiedMember_019cbfed-68ff-7cc5-b7ed-e53efab4753f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_019cbfed-68ff-7f4d-943d-6b4647a2746b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7fea-82c2-aea7e123cfa5" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_019cbfed-68ff-7f4d-943d-6b4647a2746b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_019cbfed-68ff-729b-8523-af39ec11fc1b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7fea-82c2-aea7e123cfa5" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_019cbfed-68ff-729b-8523-af39ec11fc1b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_019cbfed-68ff-78d9-830a-bbc8ff744789" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-68ff-7fea-82c2-aea7e123cfa5" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_019cbfed-68ff-78d9-830a-bbc8ff744789" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanRestructuringModificationAxis_019cbfed-68ff-7e25-a7e7-b2caa182da6f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoanRestructuringModificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_019cbfed-68ff-7c1f-98e7-d48ce4955473" xlink:to="loc_us-gaap_LoanRestructuringModificationAxis_019cbfed-68ff-7e25-a7e7-b2caa182da6f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanRestructuringModificationDomain_019cbfed-68ff-7e25-a7e7-b2caa182da6f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoanRestructuringModificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LoanRestructuringModificationAxis_019cbfed-68ff-7e25-a7e7-b2caa182da6f" xlink:to="loc_us-gaap_LoanRestructuringModificationDomain_019cbfed-68ff-7e25-a7e7-b2caa182da6f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanRestructuringModificationDomain_019cbfed-68ff-718f-9044-86ab75d54e67" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoanRestructuringModificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LoanRestructuringModificationAxis_019cbfed-68ff-7e25-a7e7-b2caa182da6f" xlink:to="loc_us-gaap_LoanRestructuringModificationDomain_019cbfed-68ff-718f-9044-86ab75d54e67" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ExtendedMaturityAndInterestRateReductionMember_019cbfed-68ff-727d-b222-ea37a2c6c82e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ExtendedMaturityAndInterestRateReductionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationDomain_019cbfed-68ff-718f-9044-86ab75d54e67" xlink:to="loc_us-gaap_ExtendedMaturityAndInterestRateReductionMember_019cbfed-68ff-727d-b222-ea37a2c6c82e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_ExtendedMaturityAndPaymentDeferralMember_019cbfed-68ff-79b6-b3c6-59ec19bdf918" xlink:href="sbcf-20260331.xsd#sbcf_ExtendedMaturityAndPaymentDeferralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationDomain_019cbfed-68ff-718f-9044-86ab75d54e67" xlink:to="loc_sbcf_ExtendedMaturityAndPaymentDeferralMember_019cbfed-68ff-79b6-b3c6-59ec19bdf918" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019cbfed-68ff-7f5a-b066-cdf3974a74af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_019cbfed-68ff-7c1f-98e7-d48ce4955473" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019cbfed-68ff-7f5a-b066-cdf3974a74af" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cbfed-68ff-7f5a-b066-cdf3974a74af_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019cbfed-68ff-7f5a-b066-cdf3974a74af" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cbfed-68ff-7f5a-b066-cdf3974a74af_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cbfed-68ff-7ab8-b1a6-6a675d2410a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019cbfed-68ff-7f5a-b066-cdf3974a74af" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cbfed-68ff-7ab8-b1a6-6a675d2410a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialAssetNotPastDueMember_019cbfed-68ff-72c4-a3ef-f06cf5d53612" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialAssetNotPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cbfed-68ff-7ab8-b1a6-6a675d2410a5" xlink:to="loc_us-gaap_FinancialAssetNotPastDueMember_019cbfed-68ff-72c4-a3ef-f06cf5d53612" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivables30To59DaysPastDueMember_019cbfed-68ff-7dd9-873c-daa121f8eb64" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivables30To59DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cbfed-68ff-7ab8-b1a6-6a675d2410a5" xlink:to="loc_us-gaap_FinancingReceivables30To59DaysPastDueMember_019cbfed-68ff-7dd9-873c-daa121f8eb64" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivables60To89DaysPastDueMember_019cbfed-68ff-7d91-a04d-baee2db42ac2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivables60To89DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cbfed-68ff-7ab8-b1a6-6a675d2410a5" xlink:to="loc_us-gaap_FinancingReceivables60To89DaysPastDueMember_019cbfed-68ff-7d91-a04d-baee2db42ac2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_019cbfed-68ff-73c6-ba64-422f2488706d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cbfed-68ff-7ab8-b1a6-6a675d2410a5" xlink:to="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_019cbfed-68ff-73c6-ba64-422f2488706d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPeriod_019cbfed-68ff-78d1-b36a-c66b52eeaa91" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_019cbfed-68ff-7787-8095-3016fc53753b" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPeriod_019cbfed-68ff-78d1-b36a-c66b52eeaa91" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableModificationToTotalFinancingReceivablesExcludingAccruedInterestPercent_019cbfed-68ff-7a43-b0c7-a5449225217c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableModificationToTotalFinancingReceivablesExcludingAccruedInterestPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_019cbfed-68ff-7787-8095-3016fc53753b" xlink:to="loc_us-gaap_FinancingReceivableModificationToTotalFinancingReceivablesExcludingAccruedInterestPercent_019cbfed-68ff-7a43-b0c7-a5449225217c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPast12Months_019cbfed-68ff-7173-900b-9bb1ab685487" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPast12Months"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_019cbfed-68ff-7787-8095-3016fc53753b" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPast12Months_019cbfed-68ff-7173-900b-9bb1ab685487" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_FinancingReceivableExcludingAccruedInterestModifiedNonaccrual_019cbfed-68ff-7891-a199-dcd195d8b621" xlink:href="sbcf-20260331.xsd#sbcf_FinancingReceivableExcludingAccruedInterestModifiedNonaccrual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_019cbfed-68ff-7787-8095-3016fc53753b" xlink:to="loc_sbcf_FinancingReceivableExcludingAccruedInterestModifiedNonaccrual_019cbfed-68ff-7891-a199-dcd195d8b621" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/AllowanceforCreditLossesScheduleofActivityinAllowanceforCreditLossesDetails" xlink:type="simple" xlink:href="sbcf-20260331.xsd#AllowanceforCreditLossesScheduleofActivityinAllowanceforCreditLossesDetails"/>
  <link:definitionLink xlink:role="http://www.seacoastbanking.com/role/AllowanceforCreditLossesScheduleofActivityinAllowanceforCreditLossesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_019cbfed-6900-78ef-837b-bc40fd11054c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_019cbfed-6900-7833-9f03-03e7cd2f7e8c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_019cbfed-6900-78ef-837b-bc40fd11054c" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_019cbfed-6900-7833-9f03-03e7cd2f7e8c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cbfed-6900-7abf-a862-6f7c97cc0e98" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_019cbfed-6900-7833-9f03-03e7cd2f7e8c" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cbfed-6900-7abf-a862-6f7c97cc0e98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-6900-7abf-a862-6f7c97cc0e98_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cbfed-6900-7abf-a862-6f7c97cc0e98" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-6900-7abf-a862-6f7c97cc0e98_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-6900-7098-be72-622023991d70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cbfed-6900-7abf-a862-6f7c97cc0e98" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-6900-7098-be72-622023991d70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_ConstructionAndLandDevelopmentPortfolioSegmentMember_019cbfed-6900-7b9b-b751-d86bf8dfcb57" xlink:href="sbcf-20260331.xsd#sbcf_ConstructionAndLandDevelopmentPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-6900-7098-be72-622023991d70" xlink:to="loc_sbcf_ConstructionAndLandDevelopmentPortfolioSegmentMember_019cbfed-6900-7b9b-b751-d86bf8dfcb57" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_CommercialRealEstatePortfolioSegmentOwnerOccupiedMember_019cbfed-6900-7d4d-ab62-2e7090b619eb" xlink:href="sbcf-20260331.xsd#sbcf_CommercialRealEstatePortfolioSegmentOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-6900-7098-be72-622023991d70" xlink:to="loc_sbcf_CommercialRealEstatePortfolioSegmentOwnerOccupiedMember_019cbfed-6900-7d4d-ab62-2e7090b619eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_CommercialRealEstatePortfolioSegmentNonOwnerOccupiedMember_019cbfed-6900-7c49-8ecd-fb61e7d44f3b" xlink:href="sbcf-20260331.xsd#sbcf_CommercialRealEstatePortfolioSegmentNonOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-6900-7098-be72-622023991d70" xlink:to="loc_sbcf_CommercialRealEstatePortfolioSegmentNonOwnerOccupiedMember_019cbfed-6900-7c49-8ecd-fb61e7d44f3b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_019cbfed-6900-7cbe-a353-fb0cb5a50b43" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-6900-7098-be72-622023991d70" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_019cbfed-6900-7cbe-a353-fb0cb5a50b43" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_019cbfed-6900-7b78-bed3-d67913b4d2f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-6900-7098-be72-622023991d70" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_019cbfed-6900-7b78-bed3-d67913b4d2f2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_019cbfed-6900-7b67-ab19-8cf0833fe5c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cbfed-6900-7098-be72-622023991d70" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_019cbfed-6900-7b67-ab19-8cf0833fe5c6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_019cbfed-6900-761a-b185-bf6bb6c9b0ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_019cbfed-6900-78ef-837b-bc40fd11054c" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_019cbfed-6900-761a-b185-bf6bb6c9b0ab" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019cbfed-6900-7e1e-86dd-b1b07453a742" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_019cbfed-6900-761a-b185-bf6bb6c9b0ab" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019cbfed-6900-7e1e-86dd-b1b07453a742" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal_019cbfed-6900-7fb5-bcf4-95169f7d2965" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_019cbfed-6900-761a-b185-bf6bb6c9b0ab" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal_019cbfed-6900-7fb5-bcf4-95169f7d2965" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019cbfed-6900-7fd6-8b5d-1d2982c3a532" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_019cbfed-6900-761a-b185-bf6bb6c9b0ab" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019cbfed-6900-7fd6-8b5d-1d2982c3a532" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery_019cbfed-6900-7fa0-9045-ce0aae40bb27" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_019cbfed-6900-761a-b185-bf6bb6c9b0ab" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery_019cbfed-6900-7fa0-9045-ce0aae40bb27" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019cbfed-6900-73e9-8d33-964480b73f6f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/DerivativesNarrativeDetails" xlink:type="simple" xlink:href="sbcf-20260331.xsd#DerivativesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.seacoastbanking.com/role/DerivativesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019cbfed-6900-7f3d-8c40-cbfb0f1d4fdd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_019cbfed-6900-7a30-ba63-86bc8888baeb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_019cbfed-6900-7f3d-8c40-cbfb0f1d4fdd" xlink:to="loc_us-gaap_DerivativeTable_019cbfed-6900-7a30-ba63-86bc8888baeb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019cfc3b-3d6b-74a3-a1bf-0e0c5ef88b7c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019cbfed-6900-7a30-ba63-86bc8888baeb" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019cfc3b-3d6b-74a3-a1bf-0e0c5ef88b7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019cfc3b-3d6b-74a3-a1bf-0e0c5ef88b7c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019cfc3b-3d6b-74a3-a1bf-0e0c5ef88b7c" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019cfc3b-3d6b-74a3-a1bf-0e0c5ef88b7c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019cfc3b-3d6b-79f5-beb4-06ba12f15718" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019cfc3b-3d6b-74a3-a1bf-0e0c5ef88b7c" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019cfc3b-3d6b-79f5-beb4-06ba12f15718" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateCapMember_019cfc3b-3d6b-7db7-9b50-3df94af063f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateCapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cfc3b-3d6b-79f5-beb4-06ba12f15718" xlink:to="loc_us-gaap_InterestRateCapMember_019cfc3b-3d6b-7db7-9b50-3df94af063f3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_InterestRateCapOneMember_019cfc3b-3d6b-7dcb-8da2-bdff4274c8dd" xlink:href="sbcf-20260331.xsd#sbcf_InterestRateCapOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestRateCapMember_019cfc3b-3d6b-7db7-9b50-3df94af063f3" xlink:to="loc_sbcf_InterestRateCapOneMember_019cfc3b-3d6b-7dcb-8da2-bdff4274c8dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_InterestRateCapTwoMember_019cfc3b-3d6b-7693-8da3-b03f34de9786" xlink:href="sbcf-20260331.xsd#sbcf_InterestRateCapTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestRateCapMember_019cfc3b-3d6b-7db7-9b50-3df94af063f3" xlink:to="loc_sbcf_InterestRateCapTwoMember_019cfc3b-3d6b-7693-8da3-b03f34de9786" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_InterestRateCapThreeMember_019cfc3b-3d6b-7816-817c-e6fc66f4ab4f" xlink:href="sbcf-20260331.xsd#sbcf_InterestRateCapThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestRateCapMember_019cfc3b-3d6b-7db7-9b50-3df94af063f3" xlink:to="loc_sbcf_InterestRateCapThreeMember_019cfc3b-3d6b-7816-817c-e6fc66f4ab4f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_SecuritiesInterestRateSwapMember_019cfc3b-7319-7e9c-b017-485ce60f954d" xlink:href="sbcf-20260331.xsd#sbcf_SecuritiesInterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cfc3b-3d6b-79f5-beb4-06ba12f15718" xlink:to="loc_sbcf_SecuritiesInterestRateSwapMember_019cfc3b-7319-7e9c-b017-485ce60f954d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_ResidentialMortgageInterestRateSwapMember_019cfc3b-7319-7a82-99d1-002eea71c711" xlink:href="sbcf-20260331.xsd#sbcf_ResidentialMortgageInterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cfc3b-3d6b-79f5-beb4-06ba12f15718" xlink:to="loc_sbcf_ResidentialMortgageInterestRateSwapMember_019cfc3b-7319-7a82-99d1-002eea71c711" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateLockCommitmentsMember_019cfc3b-9a49-7609-8692-75d0473fa588" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateLockCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cfc3b-3d6b-79f5-beb4-06ba12f15718" xlink:to="loc_us-gaap_InterestRateLockCommitmentsMember_019cfc3b-9a49-7609-8692-75d0473fa588" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019cfc3b-3d6b-7f95-b2c7-396b6db6b9d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019cbfed-6900-7a30-ba63-86bc8888baeb" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019cfc3b-3d6b-7f95-b2c7-396b6db6b9d3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019cfc3b-3d6b-7f95-b2c7-396b6db6b9d3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019cfc3b-3d6b-7f95-b2c7-396b6db6b9d3" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019cfc3b-3d6b-7f95-b2c7-396b6db6b9d3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019cfc3b-3d6b-798a-b86f-54924a158094" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019cfc3b-3d6b-7f95-b2c7-396b6db6b9d3" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019cfc3b-3d6b-798a-b86f-54924a158094" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_019cfc3b-3d6b-7356-beee-7c0b6a840c43" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019cfc3b-3d6b-798a-b86f-54924a158094" xlink:to="loc_us-gaap_CashFlowHedgingMember_019cfc3b-3d6b-7356-beee-7c0b6a840c43" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNumberOfInstrumentsHeld_019cfc3b-3d6b-7d25-8648-a9575419dfea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeNumberOfInstrumentsHeld"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019cbfed-6900-7f3d-8c40-cbfb0f1d4fdd" xlink:to="loc_us-gaap_DerivativeNumberOfInstrumentsHeld_019cfc3b-3d6b-7d25-8648-a9575419dfea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_019cfc3b-3d6b-7656-970e-0c48e29cba47" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019cbfed-6900-7f3d-8c40-cbfb0f1d4fdd" xlink:to="loc_us-gaap_DerivativeNotionalAmount_019cfc3b-3d6b-7656-970e-0c48e29cba47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_019cfc3b-3d6b-7966-b916-81bfa6af0779" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019cbfed-6900-7f3d-8c40-cbfb0f1d4fdd" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_019cfc3b-3d6b-7966-b916-81bfa6af0779" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax_019cfc3b-3d6b-71ec-a191-66630c805b9a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019cbfed-6900-7f3d-8c40-cbfb0f1d4fdd" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax_019cfc3b-3d6b-71ec-a191-66630c805b9a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_019cfc3b-3d6b-7e40-b750-1575a4fadc51" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019cbfed-6900-7f3d-8c40-cbfb0f1d4fdd" xlink:to="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_019cfc3b-3d6b-7e40-b750-1575a4fadc51" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_OtherComprehensiveIncomeLossFairValueHedgeGainLossBeforeReclassificationAndTax_019cfc3b-7319-79ab-b46d-09c8aea69e19" xlink:href="sbcf-20260331.xsd#sbcf_OtherComprehensiveIncomeLossFairValueHedgeGainLossBeforeReclassificationAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019cbfed-6900-7f3d-8c40-cbfb0f1d4fdd" xlink:to="loc_sbcf_OtherComprehensiveIncomeLossFairValueHedgeGainLossBeforeReclassificationAndTax_019cfc3b-7319-79ab-b46d-09c8aea69e19" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_OtherComprehensiveIncomeLossFairValueHedgeGainLossReclassificationBeforeTax_019cfc3b-7319-7399-ad53-5ad5b0cd4054" xlink:href="sbcf-20260331.xsd#sbcf_OtherComprehensiveIncomeLossFairValueHedgeGainLossReclassificationBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019cbfed-6900-7f3d-8c40-cbfb0f1d4fdd" xlink:to="loc_sbcf_OtherComprehensiveIncomeLossFairValueHedgeGainLossReclassificationBeforeTax_019cfc3b-7319-7399-ad53-5ad5b0cd4054" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDerivativeInstrumentsNetPretax_019cfc3b-7319-79ee-9c86-2eea798144c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnDerivativeInstrumentsNetPretax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019cbfed-6900-7f3d-8c40-cbfb0f1d4fdd" xlink:to="loc_us-gaap_GainLossOnDerivativeInstrumentsNetPretax_019cfc3b-7319-79ee-9c86-2eea798144c2" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/DerivativesScheduleofDerivativeInstrumentsDetails" xlink:type="simple" xlink:href="sbcf-20260331.xsd#DerivativesScheduleofDerivativeInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.seacoastbanking.com/role/DerivativesScheduleofDerivativeInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019cbfed-6900-7b89-8f61-82142e903995" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019cbfed-6900-758d-99c1-f7dc06c11131" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019cbfed-6900-7b89-8f61-82142e903995" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019cbfed-6900-758d-99c1-f7dc06c11131" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_019cfc41-16d3-7cd0-bb84-a934c16c9501" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019cbfed-6900-758d-99c1-f7dc06c11131" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_019cfc41-16d3-7cd0-bb84-a934c16c9501" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_019cfc41-16d3-7cd0-bb84-a934c16c9501_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_019cfc41-16d3-7cd0-bb84-a934c16c9501" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_019cfc41-16d3-7cd0-bb84-a934c16c9501_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_019cfc41-16d3-7206-870c-8f722be2db84" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_019cfc41-16d3-7cd0-bb84-a934c16c9501" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_019cfc41-16d3-7206-870c-8f722be2db84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_OtherAssetsAndOtherLiabilitiesMember_019cfc41-16d3-7927-b8d4-8952f30c1026" xlink:href="sbcf-20260331.xsd#sbcf_OtherAssetsAndOtherLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_019cfc41-16d3-7206-870c-8f722be2db84" xlink:to="loc_sbcf_OtherAssetsAndOtherLiabilitiesMember_019cfc41-16d3-7927-b8d4-8952f30c1026" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesMember_019cfc41-16d3-73ab-a35c-f8fb956ae6b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_019cfc41-16d3-7206-870c-8f722be2db84" xlink:to="loc_us-gaap_OtherLiabilitiesMember_019cfc41-16d3-73ab-a35c-f8fb956ae6b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsMember_019cfc41-16d3-764b-bba4-afde7912ef18" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_019cfc41-16d3-7206-870c-8f722be2db84" xlink:to="loc_us-gaap_OtherAssetsMember_019cfc41-16d3-764b-bba4-afde7912ef18" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019cfc41-16d3-779a-b776-50b742f1d5f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019cbfed-6900-758d-99c1-f7dc06c11131" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019cfc41-16d3-779a-b776-50b742f1d5f2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019cfc41-16d3-779a-b776-50b742f1d5f2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019cfc41-16d3-779a-b776-50b742f1d5f2" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019cfc41-16d3-779a-b776-50b742f1d5f2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019cfc41-16d3-736c-b91a-157b88caba67" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019cfc41-16d3-779a-b776-50b742f1d5f2" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019cfc41-16d3-736c-b91a-157b88caba67" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_019cfc41-16d3-77e0-8555-214d710353e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cfc41-16d3-736c-b91a-157b88caba67" xlink:to="loc_us-gaap_InterestRateContractMember_019cfc41-16d3-77e0-8555-214d710353e5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_ResidentialMortgageInterestRateSwapMember_019cfc41-16d3-7bc1-bad6-9ab5aedd104d" xlink:href="sbcf-20260331.xsd#sbcf_ResidentialMortgageInterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cfc41-16d3-736c-b91a-157b88caba67" xlink:to="loc_sbcf_ResidentialMortgageInterestRateSwapMember_019cfc41-16d3-7bc1-bad6-9ab5aedd104d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateCapMember_019cfc41-16d3-7f9c-acbc-753ee52f1d28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateCapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cfc41-16d3-736c-b91a-157b88caba67" xlink:to="loc_us-gaap_InterestRateCapMember_019cfc41-16d3-7f9c-acbc-753ee52f1d28" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateLockCommitmentsMember_019cfc41-16d3-7791-bd4b-e7dd217fb600" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateLockCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cfc41-16d3-736c-b91a-157b88caba67" xlink:to="loc_us-gaap_InterestRateLockCommitmentsMember_019cfc41-16d3-7791-bd4b-e7dd217fb600" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_ForwardTBAMortgageBackedSecuritiesMember_019cfc41-16d3-76bd-acd3-4c583e5006df" xlink:href="sbcf-20260331.xsd#sbcf_ForwardTBAMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cfc41-16d3-736c-b91a-157b88caba67" xlink:to="loc_sbcf_ForwardTBAMortgageBackedSecuritiesMember_019cfc41-16d3-76bd-acd3-4c583e5006df" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_ForwardLoanSaleCommitmentMember_019cfc41-16d3-7acb-8fcc-563c3d95c1c5" xlink:href="sbcf-20260331.xsd#sbcf_ForwardLoanSaleCommitmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cfc41-16d3-736c-b91a-157b88caba67" xlink:to="loc_sbcf_ForwardLoanSaleCommitmentMember_019cfc41-16d3-7acb-8fcc-563c3d95c1c5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_InterestRateContractsRiskParticipationAgreementsMember_019cfc48-dd5e-7218-b667-d93e7d018e48" xlink:href="sbcf-20260331.xsd#sbcf_InterestRateContractsRiskParticipationAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cfc41-16d3-736c-b91a-157b88caba67" xlink:to="loc_sbcf_InterestRateContractsRiskParticipationAgreementsMember_019cfc48-dd5e-7218-b667-d93e7d018e48" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019cfc41-16d3-739a-a4a9-be3ec509f749" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019cbfed-6900-758d-99c1-f7dc06c11131" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019cfc41-16d3-739a-a4a9-be3ec509f749" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019cfc41-16d3-739a-a4a9-be3ec509f749_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019cfc41-16d3-739a-a4a9-be3ec509f749" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019cfc41-16d3-739a-a4a9-be3ec509f749_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019cfc41-16d3-7be8-9f97-9dfbe97a2638" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019cfc41-16d3-739a-a4a9-be3ec509f749" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019cfc41-16d3-7be8-9f97-9dfbe97a2638" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueHedgingMember_019cfc41-16d3-7c58-8c29-e33818db515e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019cfc41-16d3-7be8-9f97-9dfbe97a2638" xlink:to="loc_us-gaap_FairValueHedgingMember_019cfc41-16d3-7c58-8c29-e33818db515e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_019cfc41-16d3-7c1d-a475-a2f58f833be6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019cfc41-16d3-7be8-9f97-9dfbe97a2638" xlink:to="loc_us-gaap_CashFlowHedgingMember_019cfc41-16d3-7c1d-a475-a2f58f833be6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_019cbfed-6900-78ca-9a7f-22e1398404a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019cbfed-6900-7b89-8f61-82142e903995" xlink:to="loc_us-gaap_DerivativeNotionalAmount_019cbfed-6900-78ca-9a7f-22e1398404a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeNet_019cbfed-6900-732c-b406-702a767a67cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFairValueOfDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019cbfed-6900-7b89-8f61-82142e903995" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeNet_019cbfed-6900-732c-b406-702a767a67cc" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/DerivativesScheduleofFairValueHedgesDetails" xlink:type="simple" xlink:href="sbcf-20260331.xsd#DerivativesScheduleofFairValueHedgesDetails"/>
  <link:definitionLink xlink:role="http://www.seacoastbanking.com/role/DerivativesScheduleofFairValueHedgesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019cbfed-6900-7f64-8d4d-4d92cb5de993" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_019cbfed-6900-737e-9ec9-c70bbb9a0f2b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_019cbfed-6900-7f64-8d4d-4d92cb5de993" xlink:to="loc_us-gaap_DerivativeTable_019cbfed-6900-737e-9ec9-c70bbb9a0f2b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_019cbfed-6900-7bca-b68a-1fe7b62d4f37" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019cbfed-6900-737e-9ec9-c70bbb9a0f2b" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_019cbfed-6900-7bca-b68a-1fe7b62d4f37" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019cbfed-6900-7bca-b68a-1fe7b62d4f37_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019cbfed-6900-7bca-b68a-1fe7b62d4f37" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019cbfed-6900-7bca-b68a-1fe7b62d4f37_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019cbfed-6900-7633-a1ad-948a679f9718" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019cbfed-6900-7bca-b68a-1fe7b62d4f37" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019cbfed-6900-7633-a1ad-948a679f9718" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableMember_019cbfed-6900-7ef4-851c-45c7843ede10" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019cbfed-6900-7633-a1ad-948a679f9718" xlink:to="loc_us-gaap_LoansReceivableMember_019cbfed-6900-7ef4-851c-45c7843ede10" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgedAssetFairValueHedge_019cbfed-6900-78e6-9a08-301b62f35194" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgedAssetFairValueHedge"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019cbfed-6900-7f64-8d4d-4d92cb5de993" xlink:to="loc_us-gaap_HedgedAssetFairValueHedge_019cbfed-6900-78e6-9a08-301b62f35194" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgedAssetFairValueHedgeCumulativeIncreaseDecrease_019cbfed-6900-774f-9c1b-086f4b6627f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgedAssetFairValueHedgeCumulativeIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019cbfed-6900-7f64-8d4d-4d92cb5de993" xlink:to="loc_us-gaap_HedgedAssetFairValueHedgeCumulativeIncreaseDecrease_019cbfed-6900-774f-9c1b-086f4b6627f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepayableFinancialAssetClosedPortfolioLastOfLayerAmortizedCost_019cbfed-6900-7974-ae8a-1130c37d5b38" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PrepayableFinancialAssetClosedPortfolioLastOfLayerAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019cbfed-6900-7f64-8d4d-4d92cb5de993" xlink:to="loc_us-gaap_PrepayableFinancialAssetClosedPortfolioLastOfLayerAmortizedCost_019cbfed-6900-7974-ae8a-1130c37d5b38" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgedAssetFairValueHedgeLastOfLayerAmount_019cbfed-6900-7423-a678-a6f39c72ed4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgedAssetFairValueHedgeLastOfLayerAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019cbfed-6900-7f64-8d4d-4d92cb5de993" xlink:to="loc_us-gaap_HedgedAssetFairValueHedgeLastOfLayerAmount_019cbfed-6900-7423-a678-a6f39c72ed4e" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/SecuritiesSoldUnderAgreementstoRepurchaseDetails" xlink:type="simple" xlink:href="sbcf-20260331.xsd#SecuritiesSoldUnderAgreementstoRepurchaseDetails"/>
  <link:definitionLink xlink:role="http://www.seacoastbanking.com/role/SecuritiesSoldUnderAgreementstoRepurchaseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesFinancingTransactionLineItems_019cbfed-6900-7553-9bf4-2c168650abaa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuritiesFinancingTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesFinancingTransactionTable_019cbfed-6900-7158-b831-09f477f6b8a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuritiesFinancingTransactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SecuritiesFinancingTransactionLineItems_019cbfed-6900-7553-9bf4-2c168650abaa" xlink:to="loc_us-gaap_SecuritiesFinancingTransactionTable_019cbfed-6900-7158-b831-09f477f6b8a7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_019cbfed-6900-78a3-9ee4-441e2ea742db" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SecuritiesFinancingTransactionTable_019cbfed-6900-7158-b831-09f477f6b8a7" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_019cbfed-6900-78a3-9ee4-441e2ea742db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cbfed-6900-78a3-9ee4-441e2ea742db_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019cbfed-6900-78a3-9ee4-441e2ea742db" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cbfed-6900-78a3-9ee4-441e2ea742db_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019cbfed-6900-7ed7-aba8-986037aad422" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019cbfed-6900-78a3-9ee4-441e2ea742db" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019cbfed-6900-7ed7-aba8-986037aad422" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cbfed-6900-7673-acd0-928e3045ccd6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019cbfed-6900-7ed7-aba8-986037aad422" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cbfed-6900-7673-acd0-928e3045ccd6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019cbfed-6900-79da-94b3-bb3df687b2e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cbfed-6900-7673-acd0-928e3045ccd6" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019cbfed-6900-79da-94b3-bb3df687b2e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019cbfed-6900-702e-88da-d42ff635feac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SecuritiesFinancingTransactionTable_019cbfed-6900-7158-b831-09f477f6b8a7" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019cbfed-6900-702e-88da-d42ff635feac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-6900-702e-88da-d42ff635feac_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cbfed-6900-702e-88da-d42ff635feac" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-6900-702e-88da-d42ff635feac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-6900-7fd5-a4f5-68bfc899987b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cbfed-6900-702e-88da-d42ff635feac" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-6900-7fd5-a4f5-68bfc899987b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_RepurchaseAgreementMember_019cbfed-6900-7b27-a466-e9d1275ac67b" xlink:href="sbcf-20260331.xsd#sbcf_RepurchaseAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbfed-6900-7fd5-a4f5-68bfc899987b" xlink:to="loc_sbcf_RepurchaseAgreementMember_019cbfed-6900-7b27-a466-e9d1275ac67b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis_019cbfed-6900-7d31-a4eb-4247f3c10cc0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SecuritiesFinancingTransactionTable_019cbfed-6900-7158-b831-09f477f6b8a7" xlink:to="loc_us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis_019cbfed-6900-7d31-a4eb-4247f3c10cc0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeSecuritiesTypeDomain_019cbfed-6900-7d31-a4eb-4247f3c10cc0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeSecuritiesTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis_019cbfed-6900-7d31-a4eb-4247f3c10cc0" xlink:to="loc_us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeSecuritiesTypeDomain_019cbfed-6900-7d31-a4eb-4247f3c10cc0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeSecuritiesTypeDomain_019cbfed-6900-7791-bf34-02e2cd283f20" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeSecuritiesTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis_019cbfed-6900-7d31-a4eb-4247f3c10cc0" xlink:to="loc_us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeSecuritiesTypeDomain_019cbfed-6900-7791-bf34-02e2cd283f20" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_019cbfed-6900-7902-973c-586f04d4f75b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeSecuritiesTypeDomain_019cbfed-6900-7791-bf34-02e2cd283f20" xlink:to="loc_us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_019cbfed-6900-7902-973c-586f04d4f75b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusAxis_019cbfed-6900-766e-9d6d-253ced6327bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgedStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SecuritiesFinancingTransactionTable_019cbfed-6900-7158-b831-09f477f6b8a7" xlink:to="loc_us-gaap_PledgedStatusAxis_019cbfed-6900-766e-9d6d-253ced6327bc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusDomain_019cbfed-6900-766e-9d6d-253ced6327bc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PledgedStatusAxis_019cbfed-6900-766e-9d6d-253ced6327bc" xlink:to="loc_us-gaap_PledgedStatusDomain_019cbfed-6900-766e-9d6d-253ced6327bc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusDomain_019cbfed-6900-7fb2-91c6-733c5d8c9fdd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PledgedStatusAxis_019cbfed-6900-766e-9d6d-253ced6327bc" xlink:to="loc_us-gaap_PledgedStatusDomain_019cbfed-6900-7fb2-91c6-733c5d8c9fdd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetPledgedAsCollateralMember_019cbfed-6900-7d8d-a7d2-ac3cb04a6513" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetPledgedAsCollateralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PledgedStatusDomain_019cbfed-6900-7fb2-91c6-733c5d8c9fdd" xlink:to="loc_us-gaap_AssetPledgedAsCollateralMember_019cbfed-6900-7d8d-a7d2-ac3cb04a6513" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_FairValueOfPledgedSecuritiesOvernightAndContinuousAbstract_019cbfed-6900-7475-bd6c-f6a35a558fc7" xlink:href="sbcf-20260331.xsd#sbcf_FairValueOfPledgedSecuritiesOvernightAndContinuousAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SecuritiesFinancingTransactionLineItems_019cbfed-6900-7553-9bf4-2c168650abaa" xlink:to="loc_sbcf_FairValueOfPledgedSecuritiesOvernightAndContinuousAbstract_019cbfed-6900-7475-bd6c-f6a35a558fc7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsOwnedAtFairValue_019cbfed-6900-7138-9642-7f21a68bcda2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentsOwnedAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_sbcf_FairValueOfPledgedSecuritiesOvernightAndContinuousAbstract_019cbfed-6900-7475-bd6c-f6a35a558fc7" xlink:to="loc_us-gaap_FinancialInstrumentsOwnedAtFairValue_019cbfed-6900-7138-9642-7f21a68bcda2" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/FairValueScheduleofFairValueofAssetsMeasuredonRecurringandNonrecurringBasisDetails" xlink:type="simple" xlink:href="sbcf-20260331.xsd#FairValueScheduleofFairValueofAssetsMeasuredonRecurringandNonrecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.seacoastbanking.com/role/FairValueScheduleofFairValueofAssetsMeasuredonRecurringandNonrecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cbfed-6900-73d6-a981-dacd51493ee9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cbfed-6900-7b28-bb71-4996e0c09567" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cbfed-6900-73d6-a981-dacd51493ee9" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cbfed-6900-7b28-bb71-4996e0c09567" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cbfed-6900-733a-9668-60d66b743bd1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cbfed-6900-7b28-bb71-4996e0c09567" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cbfed-6900-733a-9668-60d66b743bd1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cbfed-6900-733a-9668-60d66b743bd1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cbfed-6900-733a-9668-60d66b743bd1" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cbfed-6900-733a-9668-60d66b743bd1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cbfed-6900-7c0a-b2a7-f31152a3797b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cbfed-6900-733a-9668-60d66b743bd1" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cbfed-6900-7c0a-b2a7-f31152a3797b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019cbfed-6900-7267-a76a-ac9cfb5d53cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cbfed-6900-7c0a-b2a7-f31152a3797b" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019cbfed-6900-7267-a76a-ac9cfb5d53cc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019cbfed-6900-7e4e-a246-79a2d4ffc34b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cbfed-6900-7c0a-b2a7-f31152a3797b" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019cbfed-6900-7e4e-a246-79a2d4ffc34b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019cbfed-6900-715d-9d9d-29e09ce6f078" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cbfed-6900-7c0a-b2a7-f31152a3797b" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019cbfed-6900-715d-9d9d-29e09ce6f078" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019cbfed-6900-76cd-9fdf-737e09840f23" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cbfed-6900-7b28-bb71-4996e0c09567" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019cbfed-6900-76cd-9fdf-737e09840f23" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019cbfed-6900-76cd-9fdf-737e09840f23_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019cbfed-6900-76cd-9fdf-737e09840f23" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019cbfed-6900-76cd-9fdf-737e09840f23_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019cbfed-6900-7d2d-ac1e-406f2043d7bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019cbfed-6900-76cd-9fdf-737e09840f23" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019cbfed-6900-7d2d-ac1e-406f2043d7bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_019cbfed-6900-7f41-8688-b7e95d7384c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_019cbfed-6900-7d2d-ac1e-406f2043d7bb" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_019cbfed-6900-7f41-8688-b7e95d7384c8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsNonrecurringMember_019cbfed-6900-7ef9-a998-92bdffe36cbf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsNonrecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_019cbfed-6900-7d2d-ac1e-406f2043d7bb" xlink:to="loc_us-gaap_FairValueMeasurementsNonrecurringMember_019cbfed-6900-7ef9-a998-92bdffe36cbf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_019cbfed-6900-7363-8cae-9c4a2351530e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cbfed-6900-73d6-a981-dacd51493ee9" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_019cbfed-6900-7363-8cae-9c4a2351530e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019cbfed-6900-79de-80d7-06fe68c0de66" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019cbfed-6900-7363-8cae-9c4a2351530e" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019cbfed-6900-79de-80d7-06fe68c0de66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019cbfed-6900-79e0-9e05-58174916470d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019cbfed-6900-7363-8cae-9c4a2351530e" xlink:to="loc_us-gaap_DerivativeAssets_019cbfed-6900-79e0-9e05-58174916470d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansHeldForSaleFairValueDisclosure_019cbfed-6900-76ee-b49b-adaaa423dd4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansHeldForSaleFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019cbfed-6900-7363-8cae-9c4a2351530e" xlink:to="loc_us-gaap_LoansHeldForSaleFairValueDisclosure_019cbfed-6900-76ee-b49b-adaaa423dd4f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableFairValueDisclosure_019cbfed-6900-7ebc-84fa-3d61c9244a9a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansReceivableFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019cbfed-6900-7363-8cae-9c4a2351530e" xlink:to="loc_us-gaap_LoansReceivableFairValueDisclosure_019cbfed-6900-7ebc-84fa-3d61c9244a9a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRealEstate_019cbfed-6900-7d43-a225-9978c4498e4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherRealEstate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019cbfed-6900-7363-8cae-9c4a2351530e" xlink:to="loc_us-gaap_OtherRealEstate_019cbfed-6900-7d43-a225-9978c4498e4e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNi_019cbfed-6900-703a-b9ea-2c0fd0b14300" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFvNi"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019cbfed-6900-7363-8cae-9c4a2351530e" xlink:to="loc_us-gaap_EquitySecuritiesFvNi_019cbfed-6900-703a-b9ea-2c0fd0b14300" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetAtFairValueAmount_019cfc4b-ad41-7329-91eb-89791af7786a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ServicingAssetAtFairValueAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019cbfed-6900-7363-8cae-9c4a2351530e" xlink:to="loc_us-gaap_ServicingAssetAtFairValueAmount_019cfc4b-ad41-7329-91eb-89791af7786a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019cbfed-6900-77a6-bafa-4f73cad43974" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cbfed-6900-73d6-a981-dacd51493ee9" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019cbfed-6900-77a6-bafa-4f73cad43974" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_019cbfed-6900-780d-b8d3-f6066c8205ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019cbfed-6900-77a6-bafa-4f73cad43974" xlink:to="loc_us-gaap_DerivativeLiabilities_019cbfed-6900-780d-b8d3-f6066c8205ff" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/FairValueNarrativeDetails" xlink:type="simple" xlink:href="sbcf-20260331.xsd#FairValueNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.seacoastbanking.com/role/FairValueNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cbfed-6900-7369-9912-b022736070a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cbfed-6900-7cc2-8e49-75e42e164879" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cbfed-6900-7369-9912-b022736070a2" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cbfed-6900-7cc2-8e49-75e42e164879" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019db573-6ded-746c-9b61-3678592bd9b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cbfed-6900-7cc2-8e49-75e42e164879" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019db573-6ded-746c-9b61-3678592bd9b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019db573-6ded-746c-9b61-3678592bd9b3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019db573-6ded-746c-9b61-3678592bd9b3" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019db573-6ded-746c-9b61-3678592bd9b3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019db573-6ded-7584-8c27-c5be84c09c8b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019db573-6ded-746c-9b61-3678592bd9b3" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019db573-6ded-7584-8c27-c5be84c09c8b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateLockCommitmentsMember_019db573-6ded-71f2-a80e-7c236ec7e7c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateLockCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019db573-6ded-7584-8c27-c5be84c09c8b" xlink:to="loc_us-gaap_InterestRateLockCommitmentsMember_019db573-6ded-71f2-a80e-7c236ec7e7c9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_ForwardLoanSaleCommitmentMember_019db573-6ded-7129-b040-0adabc83fbbb" xlink:href="sbcf-20260331.xsd#sbcf_ForwardLoanSaleCommitmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019db573-6ded-7584-8c27-c5be84c09c8b" xlink:to="loc_sbcf_ForwardLoanSaleCommitmentMember_019db573-6ded-7129-b040-0adabc83fbbb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_019db573-6ded-74eb-bc88-51e645d166fa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cbfed-6900-7cc2-8e49-75e42e164879" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_019db573-6ded-74eb-bc88-51e645d166fa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_019db573-6ded-74eb-bc88-51e645d166fa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_019db573-6ded-74eb-bc88-51e645d166fa" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_019db573-6ded-74eb-bc88-51e645d166fa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_019db573-6ded-7013-9daf-1ac309726f8c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_019db573-6ded-74eb-bc88-51e645d166fa" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_019db573-6ded-7013-9daf-1ac309726f8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_MeasurementInputWeightedAveragePullThroughRateMember_019db573-6ded-7f75-b315-0752a08dcbd6" xlink:href="sbcf-20260331.xsd#sbcf_MeasurementInputWeightedAveragePullThroughRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019db573-6ded-7013-9daf-1ac309726f8c" xlink:to="loc_sbcf_MeasurementInputWeightedAveragePullThroughRateMember_019db573-6ded-7f75-b315-0752a08dcbd6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_MeasurementInputWeightedAverageCurrentReferencePriceMember_019db573-6ded-7ae9-9ce1-db036da3788a" xlink:href="sbcf-20260331.xsd#sbcf_MeasurementInputWeightedAverageCurrentReferencePriceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019db573-6ded-7013-9daf-1ac309726f8c" xlink:to="loc_sbcf_MeasurementInputWeightedAverageCurrentReferencePriceMember_019db573-6ded-7ae9-9ce1-db036da3788a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019de0bb-b82c-7911-854f-dfbca8392ec7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cbfed-6900-7cc2-8e49-75e42e164879" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019de0bb-b82c-7911-854f-dfbca8392ec7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019de0bb-b82c-7911-854f-dfbca8392ec7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019de0bb-b82c-7911-854f-dfbca8392ec7" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019de0bb-b82c-7911-854f-dfbca8392ec7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019de0bb-b82c-72b7-bbfc-0ca85ffa07fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019de0bb-b82c-7911-854f-dfbca8392ec7" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019de0bb-b82c-72b7-bbfc-0ca85ffa07fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_CollateralDependentRealEstateLoansMember_019de0bb-b82c-75bf-81af-4ad208f70d02" xlink:href="sbcf-20260331.xsd#sbcf_CollateralDependentRealEstateLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019de0bb-b82c-72b7-bbfc-0ca85ffa07fc" xlink:to="loc_sbcf_CollateralDependentRealEstateLoansMember_019de0bb-b82c-75bf-81af-4ad208f70d02" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cbfed-6900-7fb8-a632-4e9e22a143b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cbfed-6900-7cc2-8e49-75e42e164879" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cbfed-6900-7fb8-a632-4e9e22a143b6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cbfed-6900-7fb8-a632-4e9e22a143b6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cbfed-6900-7fb8-a632-4e9e22a143b6" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cbfed-6900-7fb8-a632-4e9e22a143b6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cbfed-6900-723f-891d-80e65ec4b860" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cbfed-6900-7fb8-a632-4e9e22a143b6" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cbfed-6900-723f-891d-80e65ec4b860" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_019cbfed-6900-7bf2-97e5-0e6c16674f05" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cbfed-6900-723f-891d-80e65ec4b860" xlink:to="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_019cbfed-6900-7bf2-97e5-0e6c16674f05" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019cbfed-6900-7c12-bf1b-1c5b3eda450d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cbfed-6900-7cc2-8e49-75e42e164879" xlink:to="loc_srt_RangeAxis_019cbfed-6900-7c12-bf1b-1c5b3eda450d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cbfed-6900-7c12-bf1b-1c5b3eda450d_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019cbfed-6900-7c12-bf1b-1c5b3eda450d" xlink:to="loc_srt_RangeMember_019cbfed-6900-7c12-bf1b-1c5b3eda450d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cbfed-6900-7885-821b-19d0a10133e1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019cbfed-6900-7c12-bf1b-1c5b3eda450d" xlink:to="loc_srt_RangeMember_019cbfed-6900-7885-821b-19d0a10133e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019cbfed-6900-7520-9d1d-ba981b1415a8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019cbfed-6900-7885-821b-19d0a10133e1" xlink:to="loc_srt_MinimumMember_019cbfed-6900-7520-9d1d-ba981b1415a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019cbfed-6900-7c1f-a0b6-11d974679908" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019cbfed-6900-7885-821b-19d0a10133e1" xlink:to="loc_srt_MaximumMember_019cbfed-6900-7c1f-a0b6-11d974679908" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetMeasurementInput_019db573-6ded-7366-8eab-fa0d8dc98432" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssetMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cbfed-6900-7369-9912-b022736070a2" xlink:to="loc_us-gaap_DerivativeAssetMeasurementInput_019db573-6ded-7366-8eab-fa0d8dc98432" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableFairValueDisclosure_019de0bb-b82c-7a64-8306-88fcbf16685c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansReceivableFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cbfed-6900-7369-9912-b022736070a2" xlink:to="loc_us-gaap_LoansReceivableFairValueDisclosure_019de0bb-b82c-7a64-8306-88fcbf16685c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019de0bb-b82c-7478-88b1-16d87860fe6e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cbfed-6900-7369-9912-b022736070a2" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019de0bb-b82c-7478-88b1-16d87860fe6e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AlternativeInvestment_019cbfed-6900-7885-9e09-97bb26d9a01d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AlternativeInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cbfed-6900-7369-9912-b022736070a2" xlink:to="loc_us-gaap_AlternativeInvestment_019cbfed-6900-7885-9e09-97bb26d9a01d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLiquidatingInvestmentRemainingPeriod1_019cbfed-6900-76de-8b6e-747ff6986648" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLiquidatingInvestmentRemainingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cbfed-6900-7369-9912-b022736070a2" xlink:to="loc_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLiquidatingInvestmentRemainingPeriod1_019cbfed-6900-76de-8b6e-747ff6986648" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments_019cbfed-6900-7f10-b546-229200292948" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cbfed-6900-7369-9912-b022736070a2" xlink:to="loc_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments_019cbfed-6900-7f10-b546-229200292948" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/FairValueScheduleofCarryingAmountandFairValueofOtherSignificantFinancialInstrumentsNotMeasuredonaRecurringBasisDetails" xlink:type="simple" xlink:href="sbcf-20260331.xsd#FairValueScheduleofCarryingAmountandFairValueofOtherSignificantFinancialInstrumentsNotMeasuredonaRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.seacoastbanking.com/role/FairValueScheduleofCarryingAmountandFairValueofOtherSignificantFinancialInstrumentsNotMeasuredonaRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cbfed-6900-7fbd-b7a2-6eee696d42fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cbfed-6900-7df6-b028-474f558e8cf7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cbfed-6900-7fbd-b7a2-6eee696d42fe" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cbfed-6900-7df6-b028-474f558e8cf7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_019cbfed-6900-7e58-aac9-cdda4ec7135d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cbfed-6900-7df6-b028-474f558e8cf7" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_019cbfed-6900-7e58-aac9-cdda4ec7135d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cbfed-6900-7e58-aac9-cdda4ec7135d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019cbfed-6900-7e58-aac9-cdda4ec7135d" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cbfed-6900-7e58-aac9-cdda4ec7135d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019cbfed-6900-727d-a991-e3107e108862" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019cbfed-6900-7e58-aac9-cdda4ec7135d" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019cbfed-6900-727d-a991-e3107e108862" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cbfed-6900-760b-afd4-795ad58902e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019cbfed-6900-727d-a991-e3107e108862" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cbfed-6900-760b-afd4-795ad58902e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019cbfed-6900-7065-943a-2c19ebfa09ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019cbfed-6900-727d-a991-e3107e108862" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019cbfed-6900-7065-943a-2c19ebfa09ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cbfed-6900-75fc-a75c-19a48c21c9d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cbfed-6900-7df6-b028-474f558e8cf7" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cbfed-6900-75fc-a75c-19a48c21c9d2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cbfed-6900-75fc-a75c-19a48c21c9d2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cbfed-6900-75fc-a75c-19a48c21c9d2" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cbfed-6900-75fc-a75c-19a48c21c9d2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cbfed-6900-7ddf-bc00-ea1c7dc82634" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cbfed-6900-75fc-a75c-19a48c21c9d2" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cbfed-6900-7ddf-bc00-ea1c7dc82634" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019cbfed-6900-71c2-a58a-8cfc4d3a75dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cbfed-6900-7ddf-bc00-ea1c7dc82634" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019cbfed-6900-71c2-a58a-8cfc4d3a75dd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019cbfed-6900-7f28-9d13-c771d5548d97" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cbfed-6900-7ddf-bc00-ea1c7dc82634" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019cbfed-6900-7f28-9d13-c771d5548d97" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019cbfed-6900-7c03-9159-79360469ecac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cbfed-6900-7ddf-bc00-ea1c7dc82634" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019cbfed-6900-7c03-9159-79360469ecac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_019cbfed-6900-7f4a-b118-fe72f8be9d5f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cbfed-6900-7fbd-b7a2-6eee696d42fe" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_019cbfed-6900-7f4a-b118-fe72f8be9d5f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss_019cbfed-6900-76bf-b126-b2babbc83d71" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019cbfed-6900-7f4a-b118-fe72f8be9d5f" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss_019cbfed-6900-76bf-b126-b2babbc83d71" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_TimeDepositsWithOtherBanks_019cbfed-6900-7030-b2a7-55c11f7b5763" xlink:href="sbcf-20260331.xsd#sbcf_TimeDepositsWithOtherBanks"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019cbfed-6900-7f4a-b118-fe72f8be9d5f" xlink:to="loc_sbcf_TimeDepositsWithOtherBanks_019cbfed-6900-7030-b2a7-55c11f7b5763" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019cbfed-6900-7ceb-a6ce-2b08b44d22d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019cbfed-6900-7f4a-b118-fe72f8be9d5f" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019cbfed-6900-7ceb-a6ce-2b08b44d22d2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019cbfed-6900-74a5-a5fb-cdba06592e24" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cbfed-6900-7fbd-b7a2-6eee696d42fe" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019cbfed-6900-74a5-a5fb-cdba06592e24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepositsFairValueDisclosure_019cbfed-6900-7d94-963f-dcc664c18518" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepositsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019cbfed-6900-74a5-a5fb-cdba06592e24" xlink:to="loc_us-gaap_DepositsFairValueDisclosure_019cbfed-6900-7d94-963f-dcc664c18518" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalHomeLoanBankBorrowingsFairValueDisclosure_019cbfed-6900-7b39-8c4e-3a9f17250a8a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FederalHomeLoanBankBorrowingsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019cbfed-6900-74a5-a5fb-cdba06592e24" xlink:to="loc_us-gaap_FederalHomeLoanBankBorrowingsFairValueDisclosure_019cbfed-6900-7b39-8c4e-3a9f17250a8a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations_019cbfed-6900-7086-aee5-3096daa5abce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019cbfed-6900-74a5-a5fb-cdba06592e24" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations_019cbfed-6900-7086-aee5-3096daa5abce" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/BusinessCombinationsNarrativeDetails" xlink:type="simple" xlink:href="sbcf-20260331.xsd#BusinessCombinationsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.seacoastbanking.com/role/BusinessCombinationsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019cbfed-6900-7eb8-a13d-dd3ce8146967" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cbfed-6900-794e-97cc-bea739e3b89a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cbfed-6900-7eb8-a13d-dd3ce8146967" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cbfed-6900-794e-97cc-bea739e3b89a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019cfc65-073e-74f3-9873-2f931b83ee46" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cbfed-6900-794e-97cc-bea739e3b89a" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019cfc65-073e-74f3-9873-2f931b83ee46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc65-073e-74f3-9873-2f931b83ee46_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019cfc65-073e-74f3-9873-2f931b83ee46" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc65-073e-74f3-9873-2f931b83ee46_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc65-073e-7906-93fa-e1d1e2067c0c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019cfc65-073e-74f3-9873-2f931b83ee46" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc65-073e-7906-93fa-e1d1e2067c0c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_VillagesBancorporationIncMember_019cfc65-073e-709a-b844-09de74c69761" xlink:href="sbcf-20260331.xsd#sbcf_VillagesBancorporationIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc65-073e-7906-93fa-e1d1e2067c0c" xlink:to="loc_sbcf_VillagesBancorporationIncMember_019cfc65-073e-709a-b844-09de74c69761" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_HeartlandBancsharesIncMember_019cfc65-a7ae-722d-a843-82ff3fa9b538" xlink:href="sbcf-20260331.xsd#sbcf_HeartlandBancsharesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc65-073e-7906-93fa-e1d1e2067c0c" xlink:to="loc_sbcf_HeartlandBancsharesIncMember_019cfc65-a7ae-722d-a843-82ff3fa9b538" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditLossStatusAxis_019cfc65-8361-7f54-80c8-23be3b825bf9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditLossStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cbfed-6900-794e-97cc-bea739e3b89a" xlink:to="loc_us-gaap_CreditLossStatusAxis_019cfc65-8361-7f54-80c8-23be3b825bf9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditLossStatusDomain_019cfc65-8361-7f54-80c8-23be3b825bf9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditLossStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditLossStatusAxis_019cfc65-8361-7f54-80c8-23be3b825bf9" xlink:to="loc_us-gaap_CreditLossStatusDomain_019cfc65-8361-7f54-80c8-23be3b825bf9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditLossStatusDomain_019cfc65-8361-7b62-aee0-5381b9322750" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditLossStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditLossStatusAxis_019cfc65-8361-7f54-80c8-23be3b825bf9" xlink:to="loc_us-gaap_CreditLossStatusDomain_019cfc65-8361-7b62-aee0-5381b9322750" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialAssetAcquiredAndNoCreditDeteriorationMember_019cfc65-8361-7aa7-a050-2bde244bba8a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialAssetAcquiredAndNoCreditDeteriorationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditLossStatusDomain_019cfc65-8361-7b62-aee0-5381b9322750" xlink:to="loc_us-gaap_FinancialAssetAcquiredAndNoCreditDeteriorationMember_019cfc65-8361-7aa7-a050-2bde244bba8a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessAcquisitionNumberOfBranches_019cfc65-073e-7b6c-a4e9-8556ba67c656" xlink:href="sbcf-20260331.xsd#sbcf_BusinessAcquisitionNumberOfBranches"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cbfed-6900-7eb8-a13d-dd3ce8146967" xlink:to="loc_sbcf_BusinessAcquisitionNumberOfBranches_019cfc65-073e-7b6c-a4e9-8556ba67c656" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_019cfc65-073e-7544-95c3-f95bc5237b98" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cbfed-6900-7eb8-a13d-dd3ce8146967" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_019cfc65-073e-7544-95c3-f95bc5237b98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableCashPaidPerAcquireeShare_019cfc65-073e-7b37-8d93-08f222ea23ec" xlink:href="sbcf-20260331.xsd#sbcf_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableCashPaidPerAcquireeShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cbfed-6900-7eb8-a13d-dd3ce8146967" xlink:to="loc_sbcf_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableCashPaidPerAcquireeShare_019cfc65-073e-7b37-8d93-08f222ea23ec" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationExchangeRatio_019cfc65-073e-7baf-a3c6-e676008da3df" xlink:href="sbcf-20260331.xsd#sbcf_BusinessCombinationExchangeRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cbfed-6900-7eb8-a13d-dd3ce8146967" xlink:to="loc_sbcf_BusinessCombinationExchangeRatio_019cfc65-073e-7baf-a3c6-e676008da3df" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableCashPaidPerAcquireeSharePercentage_019cfc65-073e-7490-941b-a9006072960b" xlink:href="sbcf-20260331.xsd#sbcf_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableCashPaidPerAcquireeSharePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cbfed-6900-7eb8-a13d-dd3ce8146967" xlink:to="loc_sbcf_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableCashPaidPerAcquireeSharePercentage_019cfc65-073e-7490-941b-a9006072960b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableEntitySharesIssuedPerAcquireeSharePercentage_019cfc65-073e-74cd-8dce-ab565e14ec1a" xlink:href="sbcf-20260331.xsd#sbcf_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableEntitySharesIssuedPerAcquireeSharePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cbfed-6900-7eb8-a13d-dd3ce8146967" xlink:to="loc_sbcf_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableEntitySharesIssuedPerAcquireeSharePercentage_019cfc65-073e-74cd-8dce-ab565e14ec1a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationCommonStockThresholdOfOutstandingStockThatWillReceivePreferredStock_019cfc65-073e-7836-bda5-7a19467a53ba" xlink:href="sbcf-20260331.xsd#sbcf_BusinessCombinationCommonStockThresholdOfOutstandingStockThatWillReceivePreferredStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cbfed-6900-7eb8-a13d-dd3ce8146967" xlink:to="loc_sbcf_BusinessCombinationCommonStockThresholdOfOutstandingStockThatWillReceivePreferredStock_019cfc65-073e-7836-bda5-7a19467a53ba" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019cfc65-073e-788d-b690-d2aa2842164e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cbfed-6900-7eb8-a13d-dd3ce8146967" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019cfc65-073e-788d-b690-d2aa2842164e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019cfc65-3af2-704d-a38d-767ac0a277b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cbfed-6900-7eb8-a13d-dd3ce8146967" xlink:to="loc_us-gaap_Goodwill_019cfc65-3af2-704d-a38d-767ac0a277b7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019cfc65-8361-74f7-8788-c3c329e4ae6c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cbfed-6900-7eb8-a13d-dd3ce8146967" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019cfc65-8361-74f7-8788-c3c329e4ae6c" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestPurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate_019cfc65-8361-7d3d-8f32-d48767991c9b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestPurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cbfed-6900-7eb8-a13d-dd3ce8146967" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestPurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate_019cfc65-8361-7d3d-8f32-d48767991c9b" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019cfc65-8361-7c20-92cb-77136ab5e099" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cbfed-6900-7eb8-a13d-dd3ce8146967" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019cfc65-8361-7c20-92cb-77136ab5e099" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice_019cfc66-05c5-7321-98ee-6da8fc281c56" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cbfed-6900-7eb8-a13d-dd3ce8146967" xlink:to="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice_019cfc66-05c5-7321-98ee-6da8fc281c56" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue_019cfc66-05c5-7dd8-9554-32d7b76a88ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cbfed-6900-7eb8-a13d-dd3ce8146967" xlink:to="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue_019cfc66-05c5-7dd8-9554-32d7b76a88ac" xlink:type="arc" order="13"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/BusinessCombinationsScheduleofPurchasePriceDetails" xlink:type="simple" xlink:href="sbcf-20260331.xsd#BusinessCombinationsScheduleofPurchasePriceDetails"/>
  <link:definitionLink xlink:role="http://www.seacoastbanking.com/role/BusinessCombinationsScheduleofPurchasePriceDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019cfc6d-0d38-713f-ac76-13b2ef6bd47a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cfc6d-0d38-72f9-917b-e67b38572478" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cfc6d-0d38-713f-ac76-13b2ef6bd47a" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cfc6d-0d38-72f9-917b-e67b38572478" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019cfc6d-0d38-7bee-800d-ec248cbd3249" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cfc6d-0d38-72f9-917b-e67b38572478" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019cfc6d-0d38-7bee-800d-ec248cbd3249" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc6d-0d38-7bee-800d-ec248cbd3249_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019cfc6d-0d38-7bee-800d-ec248cbd3249" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc6d-0d38-7bee-800d-ec248cbd3249_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc6d-0d38-7f92-8941-25ca0087efc7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019cfc6d-0d38-7bee-800d-ec248cbd3249" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc6d-0d38-7f92-8941-25ca0087efc7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_VillagesBancorporationIncMember_019cfc6d-0d38-7969-a4a3-125c97d56f96" xlink:href="sbcf-20260331.xsd#sbcf_VillagesBancorporationIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc6d-0d38-7f92-8941-25ca0087efc7" xlink:to="loc_sbcf_VillagesBancorporationIncMember_019cfc6d-0d38-7969-a4a3-125c97d56f96" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_HeartlandBancsharesIncMember_019cfc6d-0d38-75ca-b4c4-5376bea74a61" xlink:href="sbcf-20260331.xsd#sbcf_HeartlandBancsharesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc6d-0d38-7f92-8941-25ca0087efc7" xlink:to="loc_sbcf_HeartlandBancsharesIncMember_019cfc6d-0d38-75ca-b4c4-5376bea74a61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019cfc6d-0d38-78c8-8bc9-d5de509e1599" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cfc6d-0d38-72f9-917b-e67b38572478" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019cfc6d-0d38-78c8-8bc9-d5de509e1599" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cfc6d-0d38-78c8-8bc9-d5de509e1599_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019cfc6d-0d38-78c8-8bc9-d5de509e1599" xlink:to="loc_us-gaap_ClassOfStockDomain_019cfc6d-0d38-78c8-8bc9-d5de509e1599_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cfc6d-0d38-7f19-a3df-d1d9c5d54d79" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019cfc6d-0d38-78c8-8bc9-d5de509e1599" xlink:to="loc_us-gaap_ClassOfStockDomain_019cfc6d-0d38-7f19-a3df-d1d9c5d54d79" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019cfc6d-0d38-7700-af6c-7be37bc2e8e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019cfc6d-0d38-7f19-a3df-d1d9c5d54d79" xlink:to="loc_us-gaap_CommonStockMember_019cfc6d-0d38-7700-af6c-7be37bc2e8e5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_019cfc6d-0d38-7ba9-91b3-a31e1acc6f28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019cfc6d-0d38-7f19-a3df-d1d9c5d54d79" xlink:to="loc_us-gaap_PreferredStockMember_019cfc6d-0d38-7ba9-91b3-a31e1acc6f28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationNumberOfCommonStockSharesAcquired_019cfc6d-0d38-7ff7-aaca-d105be23d02d" xlink:href="sbcf-20260331.xsd#sbcf_BusinessCombinationNumberOfCommonStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cfc6d-0d38-713f-ac76-13b2ef6bd47a" xlink:to="loc_sbcf_BusinessCombinationNumberOfCommonStockSharesAcquired_019cfc6d-0d38-7ff7-aaca-d105be23d02d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationExchangeRatio_019cfc6d-0d38-71a9-a7fc-a7e5cf059818" xlink:href="sbcf-20260331.xsd#sbcf_BusinessCombinationExchangeRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cfc6d-0d38-713f-ac76-13b2ef6bd47a" xlink:to="loc_sbcf_BusinessCombinationExchangeRatio_019cfc6d-0d38-71a9-a7fc-a7e5cf059818" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_019cfc6d-0d38-7c50-8677-1dc87acca33e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cfc6d-0d38-713f-ac76-13b2ef6bd47a" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_019cfc6d-0d38-7c50-8677-1dc87acca33e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionSharePrice_019cfc6d-0d38-787d-9927-c0ce1c8b6b18" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionSharePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cfc6d-0d38-713f-ac76-13b2ef6bd47a" xlink:to="loc_us-gaap_BusinessAcquisitionSharePrice_019cfc6d-0d38-787d-9927-c0ce1c8b6b18" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_019cfc6d-0d38-7e65-bff6-e41d8aa587ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cfc6d-0d38-713f-ac76-13b2ef6bd47a" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_019cfc6d-0d38-7e65-bff6-e41d8aa587ea" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationNumberOfCommonStockSharesAcquiredReceivedCash_019cfc6d-0d38-7161-80fb-0b8d56ab6e8a" xlink:href="sbcf-20260331.xsd#sbcf_BusinessCombinationNumberOfCommonStockSharesAcquiredReceivedCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cfc6d-0d38-713f-ac76-13b2ef6bd47a" xlink:to="loc_sbcf_BusinessCombinationNumberOfCommonStockSharesAcquiredReceivedCash_019cfc6d-0d38-7161-80fb-0b8d56ab6e8a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableCashPaidPerAcquireeShare_019cfc6d-0d38-77e7-b250-ef31018cdca2" xlink:href="sbcf-20260331.xsd#sbcf_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableCashPaidPerAcquireeShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cfc6d-0d38-713f-ac76-13b2ef6bd47a" xlink:to="loc_sbcf_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableCashPaidPerAcquireeShare_019cfc6d-0d38-77e7-b250-ef31018cdca2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_019cfc6d-0d38-7726-8024-3b88743b256d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cfc6d-0d38-713f-ac76-13b2ef6bd47a" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_019cfc6d-0d38-7726-8024-3b88743b256d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_PaymentsToAcquireBusinessesOptionHolders_019cfc6d-0d38-7b1c-ab2c-fdc330d10392" xlink:href="sbcf-20260331.xsd#sbcf_PaymentsToAcquireBusinessesOptionHolders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cfc6d-0d38-713f-ac76-13b2ef6bd47a" xlink:to="loc_sbcf_PaymentsToAcquireBusinessesOptionHolders_019cfc6d-0d38-7b1c-ab2c-fdc330d10392" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019cfc6d-0d38-70ac-ae6a-ec896b23ba71" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cfc6d-0d38-713f-ac76-13b2ef6bd47a" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019cfc6d-0d38-70ac-ae6a-ec896b23ba71" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationPreferredStockToCommonStockRatio_019d4ca5-0ecc-7156-9f14-f7fbb5010f6f" xlink:href="sbcf-20260331.xsd#sbcf_BusinessCombinationPreferredStockToCommonStockRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cfc6d-0d38-713f-ac76-13b2ef6bd47a" xlink:to="loc_sbcf_BusinessCombinationPreferredStockToCommonStockRatio_019d4ca5-0ecc-7156-9f14-f7fbb5010f6f" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/BusinessCombinationsScheduleofFairValueofAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="simple" xlink:href="sbcf-20260331.xsd#BusinessCombinationsScheduleofFairValueofAssetsAcquiredandLiabilitiesAssumedDetails"/>
  <link:definitionLink xlink:role="http://www.seacoastbanking.com/role/BusinessCombinationsScheduleofFairValueofAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019cfc74-4258-769f-9e13-306c9ea9366c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cfc74-4258-7850-b418-6fd2cab0a963" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cfc74-4258-769f-9e13-306c9ea9366c" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cfc74-4258-7850-b418-6fd2cab0a963" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019cfc74-4258-7f65-8af4-d74050269d66" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cfc74-4258-7850-b418-6fd2cab0a963" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019cfc74-4258-7f65-8af4-d74050269d66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc74-4258-7f65-8af4-d74050269d66_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019cfc74-4258-7f65-8af4-d74050269d66" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc74-4258-7f65-8af4-d74050269d66_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc74-4258-7828-8adf-78300d708c93" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019cfc74-4258-7f65-8af4-d74050269d66" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc74-4258-7828-8adf-78300d708c93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_VillagesBancorporationIncMember_019cfc74-4258-736d-8d3c-63b535f04022" xlink:href="sbcf-20260331.xsd#sbcf_VillagesBancorporationIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc74-4258-7828-8adf-78300d708c93" xlink:to="loc_sbcf_VillagesBancorporationIncMember_019cfc74-4258-736d-8d3c-63b535f04022" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_HeartlandBancsharesIncMember_019cfc74-4258-7427-84e3-df5bce4c348f" xlink:href="sbcf-20260331.xsd#sbcf_HeartlandBancsharesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc74-4258-7828-8adf-78300d708c93" xlink:to="loc_sbcf_HeartlandBancsharesIncMember_019cfc74-4258-7427-84e3-df5bce4c348f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAxis_019d4cc2-416d-7fa9-9279-4967bd568704" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RestatementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cfc74-4258-7850-b418-6fd2cab0a963" xlink:to="loc_srt_RestatementAxis_019d4cc2-416d-7fa9-9279-4967bd568704" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_019d4cc2-416d-7fa9-9279-4967bd568704_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_019d4cc2-416d-7fa9-9279-4967bd568704" xlink:to="loc_srt_RestatementDomain_019d4cc2-416d-7fa9-9279-4967bd568704_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_019d4cc2-416d-714a-95a6-def1fe6381db" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_019d4cc2-416d-7fa9-9279-4967bd568704" xlink:to="loc_srt_RestatementDomain_019d4cc2-416d-714a-95a6-def1fe6381db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioPreviouslyReportedMember_019d4cc2-416d-7323-83e7-ddb7236e54ce" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioPreviouslyReportedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_019d4cc2-416d-714a-95a6-def1fe6381db" xlink:to="loc_srt_ScenarioPreviouslyReportedMember_019d4cc2-416d-7323-83e7-ddb7236e54ce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019cfc74-4258-7d51-8a5d-5814daebb0e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cfc74-4258-769f-9e13-306c9ea9366c" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019cfc74-4258-7d51-8a5d-5814daebb0e6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_019cfc74-4258-707f-ab18-eb30fa4c5654" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019cfc74-4258-7d51-8a5d-5814daebb0e6" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_019cfc74-4258-707f-ab18-eb30fa4c5654" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationRecognizedAssetAcquiredInvestmentSecurities_019cfc74-4258-7a5f-b828-80e5940828e5" xlink:href="sbcf-20260331.xsd#sbcf_BusinessCombinationRecognizedAssetAcquiredInvestmentSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019cfc74-4258-7d51-8a5d-5814daebb0e6" xlink:to="loc_sbcf_BusinessCombinationRecognizedAssetAcquiredInvestmentSecurities_019cfc74-4258-7a5f-b828-80e5940828e5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationRecognizedAssetAcquiredFinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019cfc74-4258-76b8-8f88-e840866a928a" xlink:href="sbcf-20260331.xsd#sbcf_BusinessCombinationRecognizedAssetAcquiredFinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019cfc74-4258-7d51-8a5d-5814daebb0e6" xlink:to="loc_sbcf_BusinessCombinationRecognizedAssetAcquiredFinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019cfc74-4258-76b8-8f88-e840866a928a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019d4cc2-416d-7a9a-9eab-c2d6cea4aaff" xlink:href="sbcf-20260331.xsd#sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019cfc74-4258-7d51-8a5d-5814daebb0e6" xlink:to="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019d4cc2-416d-7a9a-9eab-c2d6cea4aaff" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019cfc74-4258-76ca-8e2e-9db197d6a9b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019cfc74-4258-7d51-8a5d-5814daebb0e6" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019cfc74-4258-76ca-8e2e-9db197d6a9b6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019cfc74-4258-7673-9bf0-5fc8b9072e2f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019cfc74-4258-7d51-8a5d-5814daebb0e6" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019cfc74-4258-7673-9bf0-5fc8b9072e2f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019cfc74-4258-7ec4-a88e-6814ae0d20bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019cfc74-4258-7d51-8a5d-5814daebb0e6" xlink:to="loc_us-gaap_Goodwill_019cfc74-4258-7ec4-a88e-6814ae0d20bb" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_019d4cc2-416d-7272-8bea-a3c7d6cdefb2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019cfc74-4258-7d51-8a5d-5814daebb0e6" xlink:to="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_019d4cc2-416d-7272-8bea-a3c7d6cdefb2" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_019cfc74-4258-7351-b7f0-f4ee1e180e7c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019cfc74-4258-7d51-8a5d-5814daebb0e6" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_019cfc74-4258-7351-b7f0-f4ee1e180e7c" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_019cfc74-4258-794d-ba39-ca4c4cef199b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019cfc74-4258-7d51-8a5d-5814daebb0e6" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_019cfc74-4258-794d-ba39-ca4c4cef199b" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssets_019d4cc2-416d-71df-b9df-681e758112ce" xlink:href="sbcf-20260331.xsd#sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019cfc74-4258-7d51-8a5d-5814daebb0e6" xlink:to="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssets_019d4cc2-416d-71df-b9df-681e758112ce" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_019cfc74-4258-7f2f-8bc3-368009917e55" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cfc74-4258-769f-9e13-306c9ea9366c" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_019cfc74-4258-7f2f-8bc3-368009917e55" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationRecognizedLiabilityAssumedDeposits_019cfc74-4258-7833-a506-97b696797e27" xlink:href="sbcf-20260331.xsd#sbcf_BusinessCombinationRecognizedLiabilityAssumedDeposits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_019cfc74-4258-7f2f-8bc3-368009917e55" xlink:to="loc_sbcf_BusinessCombinationRecognizedLiabilityAssumedDeposits_019cfc74-4258-7833-a506-97b696797e27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationRecognizedLiabilityAssumedSecuritiesSoldUnderAgreementsToRepurchase_019cfc74-4258-7eed-928f-d3b38feddd6a" xlink:href="sbcf-20260331.xsd#sbcf_BusinessCombinationRecognizedLiabilityAssumedSecuritiesSoldUnderAgreementsToRepurchase"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_019cfc74-4258-7f2f-8bc3-368009917e55" xlink:to="loc_sbcf_BusinessCombinationRecognizedLiabilityAssumedSecuritiesSoldUnderAgreementsToRepurchase_019cfc74-4258-7eed-928f-d3b38feddd6a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_019cfc74-4258-7ea2-b4cd-b49d1bdd3918" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_019cfc74-4258-7f2f-8bc3-368009917e55" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_019cfc74-4258-7ea2-b4cd-b49d1bdd3918" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNoncurrentLiabilitiesOther_019d4cc2-416d-7ab2-a6f4-3a069bc36f05" xlink:href="sbcf-20260331.xsd#sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNoncurrentLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_019cfc74-4258-7f2f-8bc3-368009917e55" xlink:to="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNoncurrentLiabilitiesOther_019d4cc2-416d-7ab2-a6f4-3a069bc36f05" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_019cfc74-4258-7528-a47f-e3025513c433" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_019cfc74-4258-7f2f-8bc3-368009917e55" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_019cfc74-4258-7528-a47f-e3025513c433" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentLiabilities_019d4cc2-416d-75d4-a3ff-a2f2e0281990" xlink:href="sbcf-20260331.xsd#sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_019cfc74-4258-7f2f-8bc3-368009917e55" xlink:to="loc_sbcf_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentLiabilities_019d4cc2-416d-75d4-a3ff-a2f2e0281990" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/BusinessCombinationsScheduleofFairValueofAcquiredLoansDetails" xlink:type="simple" xlink:href="sbcf-20260331.xsd#BusinessCombinationsScheduleofFairValueofAcquiredLoansDetails"/>
  <link:definitionLink xlink:role="http://www.seacoastbanking.com/role/BusinessCombinationsScheduleofFairValueofAcquiredLoansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019cfc7d-7be0-7d0c-9b53-dd4ffd48e409" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cfc7d-7be0-7164-be70-e564cbeb4858" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cfc7d-7be0-7d0c-9b53-dd4ffd48e409" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cfc7d-7be0-7164-be70-e564cbeb4858" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019cfc7d-7be0-7aad-8745-954c5d2f5075" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cfc7d-7be0-7164-be70-e564cbeb4858" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019cfc7d-7be0-7aad-8745-954c5d2f5075" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc7d-7be0-7aad-8745-954c5d2f5075_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019cfc7d-7be0-7aad-8745-954c5d2f5075" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc7d-7be0-7aad-8745-954c5d2f5075_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc7d-7be0-719a-ac32-8b272102573c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019cfc7d-7be0-7aad-8745-954c5d2f5075" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc7d-7be0-719a-ac32-8b272102573c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_VillagesBancorporationIncMember_019cfc7d-7be0-7282-95b2-16d75b56693f" xlink:href="sbcf-20260331.xsd#sbcf_VillagesBancorporationIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc7d-7be0-719a-ac32-8b272102573c" xlink:to="loc_sbcf_VillagesBancorporationIncMember_019cfc7d-7be0-7282-95b2-16d75b56693f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_HeartlandBancsharesIncMember_019cfc7d-7be0-76f1-bcaa-933de65581f8" xlink:href="sbcf-20260331.xsd#sbcf_HeartlandBancsharesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc7d-7be0-719a-ac32-8b272102573c" xlink:to="loc_sbcf_HeartlandBancsharesIncMember_019cfc7d-7be0-76f1-bcaa-933de65581f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019cfc7d-7be0-754c-9b7f-f1f73e155959" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cfc7d-7be0-7164-be70-e564cbeb4858" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019cfc7d-7be0-754c-9b7f-f1f73e155959" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cfc7d-7be0-754c-9b7f-f1f73e155959_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cfc7d-7be0-754c-9b7f-f1f73e155959" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cfc7d-7be0-754c-9b7f-f1f73e155959_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cfc7d-7be0-7678-85d8-2337d783e768" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cfc7d-7be0-754c-9b7f-f1f73e155959" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cfc7d-7be0-7678-85d8-2337d783e768" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_ConstructionAndLandDevelopmentPortfolioSegmentMember_019cfc7d-7be0-7224-ba22-d49fc172e21b" xlink:href="sbcf-20260331.xsd#sbcf_ConstructionAndLandDevelopmentPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cfc7d-7be0-7678-85d8-2337d783e768" xlink:to="loc_sbcf_ConstructionAndLandDevelopmentPortfolioSegmentMember_019cfc7d-7be0-7224-ba22-d49fc172e21b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_CommercialRealEstatePortfolioSegmentOwnerOccupiedMember_019cfc7d-7be0-74b0-a199-62e61ab1681d" xlink:href="sbcf-20260331.xsd#sbcf_CommercialRealEstatePortfolioSegmentOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cfc7d-7be0-7678-85d8-2337d783e768" xlink:to="loc_sbcf_CommercialRealEstatePortfolioSegmentOwnerOccupiedMember_019cfc7d-7be0-74b0-a199-62e61ab1681d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_CommercialRealEstatePortfolioSegmentNonOwnerOccupiedMember_019cfc7d-7be0-7b43-8714-3254754fef38" xlink:href="sbcf-20260331.xsd#sbcf_CommercialRealEstatePortfolioSegmentNonOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cfc7d-7be0-7678-85d8-2337d783e768" xlink:to="loc_sbcf_CommercialRealEstatePortfolioSegmentNonOwnerOccupiedMember_019cfc7d-7be0-7b43-8714-3254754fef38" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_019cfc7d-7be0-7c12-ac6c-3be6c85b0d52" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cfc7d-7be0-7678-85d8-2337d783e768" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_019cfc7d-7be0-7c12-ac6c-3be6c85b0d52" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_019cfc7d-7be0-7369-bc5a-3d387e37242c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cfc7d-7be0-7678-85d8-2337d783e768" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_019cfc7d-7be0-7369-bc5a-3d387e37242c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_019cfc7d-7be0-74f1-b53a-814371dedae3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cfc7d-7be0-7678-85d8-2337d783e768" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_019cfc7d-7be0-74f1-b53a-814371dedae3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount_019cfc7d-7be0-7124-946e-7715609b4ba5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cfc7d-7be0-7d0c-9b53-dd4ffd48e409" xlink:to="loc_us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount_019cfc7d-7be0-7124-946e-7715609b4ba5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquiredReceivablesFairValue_019cfc7d-7be0-7d9b-82a8-c806df2d3f3c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationAcquiredReceivablesFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cfc7d-7be0-7d0c-9b53-dd4ffd48e409" xlink:to="loc_us-gaap_BusinessCombinationAcquiredReceivablesFairValue_019cfc7d-7be0-7d9b-82a8-c806df2d3f3c" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/BusinessCombinationsScheduleofLoanswithDeteriorationofCreditQualityDetails" xlink:type="simple" xlink:href="sbcf-20260331.xsd#BusinessCombinationsScheduleofLoanswithDeteriorationofCreditQualityDetails"/>
  <link:definitionLink xlink:role="http://www.seacoastbanking.com/role/BusinessCombinationsScheduleofLoanswithDeteriorationofCreditQualityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019cfc80-e962-7144-b8ec-8dde1e8bf7aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cfc80-e962-72e2-a81c-ec7c26a77cf4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cfc80-e962-7144-b8ec-8dde1e8bf7aa" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cfc80-e962-72e2-a81c-ec7c26a77cf4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019cfc80-e962-72c7-917c-284b50ad83a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cfc80-e962-72e2-a81c-ec7c26a77cf4" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019cfc80-e962-72c7-917c-284b50ad83a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc80-e962-72c7-917c-284b50ad83a4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019cfc80-e962-72c7-917c-284b50ad83a4" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc80-e962-72c7-917c-284b50ad83a4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc80-e962-7c58-a971-7ff60160a391" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019cfc80-e962-72c7-917c-284b50ad83a4" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc80-e962-7c58-a971-7ff60160a391" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_VillagesBancorporationIncMember_019cfc80-e962-7c6b-8edc-4c025712e30b" xlink:href="sbcf-20260331.xsd#sbcf_VillagesBancorporationIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cfc80-e962-7c58-a971-7ff60160a391" xlink:to="loc_sbcf_VillagesBancorporationIncMember_019cfc80-e962-7c6b-8edc-4c025712e30b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue_019cfc80-e962-7303-9000-73710653979e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cfc80-e962-7144-b8ec-8dde1e8bf7aa" xlink:to="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue_019cfc80-e962-7303-9000-73710653979e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate_019cfc80-e962-7331-b7ff-23f95b013948" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cfc80-e962-7144-b8ec-8dde1e8bf7aa" xlink:to="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate_019cfc80-e962-7331-b7ff-23f95b013948" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationDiscountPremium_019cfc80-e962-7808-9e8f-03fc9e81430d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationDiscountPremium"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cfc80-e962-7144-b8ec-8dde1e8bf7aa" xlink:to="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationDiscountPremium_019cfc80-e962-7808-9e8f-03fc9e81430d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice_019cfc80-e962-7454-b62e-482da7c6f358" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cfc80-e962-7144-b8ec-8dde1e8bf7aa" xlink:to="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice_019cfc80-e962-7454-b62e-482da7c6f358" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/BusinessCombinationsScheduleofProFormaInformationDetails" xlink:type="simple" xlink:href="sbcf-20260331.xsd#BusinessCombinationsScheduleofProFormaInformationDetails"/>
  <link:definitionLink xlink:role="http://www.seacoastbanking.com/role/BusinessCombinationsScheduleofProFormaInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019cbfed-6900-7844-9efa-4dc001365fe7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cbfed-6900-7512-ad74-c31fca6a752e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cbfed-6900-7844-9efa-4dc001365fe7" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cbfed-6900-7512-ad74-c31fca6a752e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019cbfed-6900-7c32-a179-ae15ffcc375f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cbfed-6900-7512-ad74-c31fca6a752e" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019cbfed-6900-7c32-a179-ae15ffcc375f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cbfed-6900-7c32-a179-ae15ffcc375f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019cbfed-6900-7c32-a179-ae15ffcc375f" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cbfed-6900-7c32-a179-ae15ffcc375f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cbfed-6900-772e-92cf-1ecbf1c8af3a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019cbfed-6900-7c32-a179-ae15ffcc375f" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cbfed-6900-772e-92cf-1ecbf1c8af3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbcf_VillagesBancorporationIncMember_019cfc84-88da-7950-aaa1-e3b59e28cec5" xlink:href="sbcf-20260331.xsd#sbcf_VillagesBancorporationIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cbfed-6900-772e-92cf-1ecbf1c8af3a" xlink:to="loc_sbcf_VillagesBancorporationIncMember_019cfc84-88da-7950-aaa1-e3b59e28cec5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaInformationAbstract_019cbfed-6900-77c0-a061-093b1fd5aac9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionProFormaInformationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cbfed-6900-7844-9efa-4dc001365fe7" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaInformationAbstract_019cbfed-6900-77c0-a061-093b1fd5aac9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_019cbfed-6900-7334-b73c-b14d988ecdb3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationAbstract_019cbfed-6900-77c0-a061-093b1fd5aac9" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_019cbfed-6900-7334-b73c-b14d988ecdb3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_019cbfed-6900-7cd2-8b17-c5ee7c753ee7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationAbstract_019cbfed-6900-77c0-a061-093b1fd5aac9" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_019cbfed-6900-7cd2-8b17-c5ee7c753ee7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted_019cbfed-6900-7898-8dc6-ad6ac4a31f04" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationAbstract_019cbfed-6900-77c0-a061-093b1fd5aac9" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted_019cbfed-6900-7898-8dc6-ad6ac4a31f04" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_019cbfed-6900-7485-bd1e-df775c29eb2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationAbstract_019cbfed-6900-77c0-a061-093b1fd5aac9" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_019cbfed-6900-7485-bd1e-df775c29eb2a" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.seacoastbanking.com/role/SubsequentEventDetails" xlink:type="simple" xlink:href="sbcf-20260331.xsd#SubsequentEventDetails"/>
  <link:definitionLink xlink:role="http://www.seacoastbanking.com/role/SubsequentEventDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_019cbfed-6900-7a03-a1b4-0884e9d5cabe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_019cbfed-6900-73a1-bac0-a28ecd54527a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_019cbfed-6900-7a03-a1b4-0884e9d5cabe" xlink:to="loc_us-gaap_SubsequentEventTable_019cbfed-6900-73a1-bac0-a28ecd54527a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019cbfed-6900-7677-94a1-1fdfcad1907a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_019cbfed-6900-73a1-bac0-a28ecd54527a" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019cbfed-6900-7677-94a1-1fdfcad1907a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019cbfed-6900-7677-94a1-1fdfcad1907a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019cbfed-6900-7677-94a1-1fdfcad1907a" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019cbfed-6900-7677-94a1-1fdfcad1907a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019cbfed-6900-7f15-8ac9-4f56593e1bd6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019cbfed-6900-7677-94a1-1fdfcad1907a" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019cbfed-6900-7f15-8ac9-4f56593e1bd6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019cbfed-6900-7872-86f0-64d9bf8e01e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019cbfed-6900-7f15-8ac9-4f56593e1bd6" xlink:to="loc_us-gaap_SubsequentEventMember_019cbfed-6900-7872-86f0-64d9bf8e01e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_019dfdcf-d6a9-7b96-8aa1-f94032847b09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019cbfed-6900-7a03-a1b4-0884e9d5cabe" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_019dfdcf-d6a9-7b96-8aa1-f94032847b09" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_019dfdcf-fa3e-7526-b072-e04cdcbbec11" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockAcquiredAverageCostPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019cbfed-6900-7a03-a1b4-0884e9d5cabe" xlink:to="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_019dfdcf-fa3e-7526-b072-e04cdcbbec11" xlink:type="arc" order="1"/>
  </link:definitionLink>
</link:linkbase>
