WordReference Random House Learner's Dictionary of American English © 2017
a•the•ism /ˈeɪθiˌɪzəm/USA pronunciation   n. [uncountable]
  1. Philosophythe doctrine or belief that there is no God.
a•the•ist, n. [countable]
a•the•ist•ic, adj. See -theo-.

WordReference Random House Unabridged Dictionary of American English © 2017
a•the•ism  thē iz′əm),USA pronunciation n. 
  1. Philosophythe doctrine or belief that there is no God.
  2. Philosophydisbelief in the existence of a supreme being or beings.
  • Greek áthe(os) godless + -ism
  • 1580–90


Collins Concise English Dictionary © HarperCollins Publishers::

atheism /ˈeɪθɪˌɪzəm/ n
  1. rejection of belief in God or gods
Etymology: 16th Century: from French athéisme, from Greek atheos godless, from a-1 + theos god



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