/ Dictionary / Index A atavism: Meaning and Definition of Find definitions for: at•a•vism Pronunciation: (at'u-viz"um), [key] — n. the reappearance in an individual of characteristics of some remote ancestor that have been absent in intervening generations. an individual embodying such a reversion. reversion to an earlier type; throwback. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: atavism (Thesaurus) atavic atavistic Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language