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

Louisiana pastor Jerry DeWitt unexpectedly became an atheist celebrity when he lost his faith.
Atheist Ex-Pastor Jerry DeWitt’s Mission to Red America David Masciotra November 16, 2013

An apostate and an atheist, she has rejected Islam as her personal creed, and she calls on Muslims, effectively, to do the same.
Ayaan Hirsi Ali’s Controversial Call to Arms Tunku Varadarajan May 21, 2010

That mentality is what some atheist thinkers believe quietly promotes magical thinking, condoning it via liberal tolerance.
The Atheist Recruiting Machine Lauren Sandler November 2, 2009

Founded in London earlier this year, the atheist church is expanding fast.
Sunday Assembly Is the Hot New Atheist Church Nico Hines September 20, 2013

(These kind of comparisons, as the atheist writer Chris Stedman has noted, help stigmatize mental illness).
The Midichlorians Made Me Do It: Can Microbes Explain Religion? Michael Schulson August 9, 2014

Historical Examples

The one knowledge constitutes the pride of the philosopher, the other the despair of the atheist.
Pascal John Tulloch

Or, do you mean that I am an atheist simply, and a teacher of atheism?
Apology Plato

Or he may entertain what appears to him independent evidence in favour of Atheism, and thus he may become an atheist.
Mind and Motion and Monism George John Romanes

“I understand,” said the atheist, glancing into Lorand’s eyes.
Debts of Honor Maurus Jkai

Nature in an agony is no atheist; the soul that knows not where to fly, flies to God.
Christianity and Greek Philosophy Benjamin Franklin Cocker

a person who does not believe in God or gods
of or relating to atheists or atheism

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]

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