/ Dictionary / Index A atheism: Meaning and Definition of Find definitions for: a•the•ism Pronunciation: (ā'thē-iz"um), [key] — n. the doctrine or belief that there is no God. disbelief in the existence of a supreme being or beings. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: atheism (Thesaurus) Atharva-Veda atheist 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