atheist
Americannoun
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atheists
plural
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a person who does not believe in the existence of a supreme being or beings.
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a person who believes that there is no supreme being or beings.
noun
adjective
Usage
What does atheist mean? An atheist is a person who does not believe in the existence of a supreme being or deity. In other words, an atheist is a person who does not believe in the existence of God or of any gods. The belief or doctrine that denies the existence of gods or supreme beings is atheism. Atheist can also be used as an adjective to describe such beliefs or things involving such beliefs. The adjective atheistic can be used in the same way. The word atheist means something different from the word agnostic, which refers to a person who believes it is impossible to know whether or not a supreme being exists. When asked if God or gods exist, an atheist would answer “No,” while an agnostic would answer “It is impossible to know.”Example: Being an atheist doesn’t mean I think God is bad—it means that I think God doesn’t exist.
Synonym Usage
See agnostic.
Other Word Forms
Derived Forms
Inflected Forms
Nouns
Etymology
Origin of atheist
First recorded in 1565–75; from Greek áthe(os) “godless” + -ist; see a- 6 ( def. ), theo-
Explanation
An atheist believes there is no such thing as god, or any other deity. The root -theist means "belief in a god." The prefixes mono-, poly-, and a-, mean "one," "many," and "no," respectively. So a monotheist is someone who believes in a single god, a polytheist is someone who believes in many gods, and an atheist is someone who believes there is no god at all.
Vocabulary lists containing atheist
The Catcher in the Rye
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World Religions
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The Stranger
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
The country that houses the world’s second-largest Hindu temple is the U.S.—also home to the Christian street preacher, the Mormon missionary and the combative atheist.
From The Wall Street Journal ● May 12, 2026
"You would say that you became an atheist after coming here. You were not one in Bangladesh," he said.
From BBC ● Apr. 15, 2026
China's officially atheist government has been wary of organized movements outside its control, and the country's Christians had been split among those attending unofficial "house" or "underground" churches and those visiting government-sanctioned places of worship.
From Barron's ● Nov. 3, 2025
He did it again with another atheist by trying to nitpick what the word "believe" means when asked if one "believes" in God.
From Salon ● Jun. 6, 2025
It wasn’t as deliberate as deciding, at age six, to become an atheist, but more like an imperceptible sloughing of layers.
From "Dreaming in Cuban" by Cristina García
Mr. Persico mentions that Martin Luther hated Jews and persecuted heretics, and he acknowledges that Locke excluded Catholics and atheists from toleration.
From The Wall Street Journal ● Oct. 24, 2025
Welch says she was raised by atheists, while Sullivan grew up in a religious household.
From Salon ● Aug. 10, 2025
The religiously unaffiliated, including atheists and agnostics, made up 13% of global migrants who have left their country of birth.
From BBC ● Aug. 19, 2024
Muslims, Jews, Christians and atheists lived in harmony and showed the possible future of Palestine as a secular, socialist inclusive state.
From Seattle Times ● May 21, 2024
Many eighteenth-century atheists, such as d’Holbach and Diderot, were to take their inspiration from Descartes’ mechanism and turn it into a systematic materialism with no room for God.
From "The Invention of Science" by David Wootton
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
