/ Dictionary / Index E exogamy: Meaning and Definition of Find definitions for: ex•og•a•my Pronunciation: (ek-sog'u-mē), [key] — n. marriage outside a specific tribe or similar social unit. Cf. endogamy. the union of gametes of unrelated parents. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: exogamy (Thesaurus) ex officio exogenetic Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language