the doctrine or belief that there is no God.
disbelief in the existence of a supreme being or beings.

1580–90; < Greek áthe(os) godless + -ism

antiatheism, adjective, noun
proatheism, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
atheism (ˈeɪθɪˌɪzəm)
rejection of belief in God or gods
[C16: from French athéisme, from Greek atheos godless, from a-1 + theos god]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1580s, from Fr. athéisme (16c.), from Gk. atheos "without god" (see atheist).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary
atheism [(ay-thee-iz-uhm)]

Denial that there is a God. (Compare agnosticism.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences for Atheism
In the religious sphere, atheism was officially promoted and taught.
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