endogamy

/ɛnˈdɑɡəmi/
noun
  1. The practice of marrying only within one's own social group, clan, or tribe.
    • In some small villages, endogamy has been the tradition for centuries to keep property within the family.
    • Endogamy can strengthen group identity but may also lead to a smaller gene pool over time.
    • The royal family practiced endogamy to maintain their bloodline and political power.
Antonyms
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