/ Dictionary / Index A atheist: Meaning and Definition of Find definitions for: a•the•ist Pronunciation: (ā'thē-ist), [key] — n. a person who denies or disbelieves the existence of a supreme being or beings. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: atheist (Thesaurus) atheism atheistic Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language