a person who denies or disbelieves the existence of a supreme being or beings.

1565–75; < Greek áthe(os) godless + -ist

antiatheist, noun, adjective
proatheist, noun, adjective

1. agnostic, atheist (see synonym study at the current entry) ; 2. atheist, theist, deist.

Atheist, agnostic, infidel, skeptic refer to persons not inclined toward religious belief or a particular form of religious belief. An atheist is one who denies the existence of a deity or of divine beings. An agnostic is one who believes it impossible to know anything about God or about the creation of the universe and refrains from commitment to any religious doctrine. Infidel means an unbeliever, especially a nonbeliever in Islam or Christianity. A skeptic doubts and is critical of all accepted doctrines and creeds. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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World English Dictionary
atheist (ˈeɪθɪˌɪst)
1.  a person who does not believe in God or gods
2.  of or relating to atheists or atheism

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1570s, from Fr. athéiste (16c.), from Gk. atheos "to deny the gods, godless," from a- "without" + theos "a god" (see Thea). A slightly earlier form is represented by atheonism (1530s) which is perhaps from It. atheo "atheist."
"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]
Related: Atheistic (1630s).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for atheists
Atheists generally do not believe that there is an afterlife.
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