Etymology
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exogamy (n.)

"the custom among certain tribes which prohibits a man from marrying a woman from his own tribe," 1865, Modern Latin, literally "outside marriage," from exo- "outer, outside" + -gamy. Related: Exogamous (1865). Apparently coined by Scottish anthropologist John Ferguson McLennan (1827-1881) in "Primitive Marriage" (see endogamy).

updated on May 15, 2021

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Definitions of exogamy from WordNet

exogamy (n.)
marriage to a person belonging to a tribe or group other than your own as required by custom or law;
Synonyms: intermarriage
From wordnet.princeton.edu, not affiliated with etymonline.