endogamous

/ɛnˈdɑɡəməs/
adjective
  1. Practicing or involving marriage or relationships within a specific social group, caste, or community.
    • Many small villages remain endogamous, with most people marrying neighbors.
    • Endogamous customs can strengthen group bonds but may limit outside connections.
    • The community's endogamous rules discouraged marrying outsiders.
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