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atheist

[ey-thee-ist]
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noun
  1. a person who denies or disbelieves the existence of a supreme being or beings.

Origin of atheist

1565–75; < Greek áthe(os) godless + -ist
Related formsan·ti·a·the·ist, noun, adjectivepro·a·the·ist, noun, adjective

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for atheist

atheist

noun
  1. a person who does not believe in God or gods
adjective
  1. of or relating to atheists or atheism
Derived Formsatheistic or atheistical, adjectiveatheistically, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for atheist

n.

1570s, from French athéiste (16c.), from Greek atheos "without god, denying the gods; abandoned of the gods; godless, ungodly," from a- "without" + theos "a god" (see Thea).

The existence of a world without God seems to me less absurd than the presence of a God, existing in all his perfection, creating an imperfect man in order to make him run the risk of Hell. [Armand Salacrou, "Certitudes et incertitudes," 1943]
Online Etymology Dictionary, © 2010 Douglas Harper

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