atheist
Americannoun
-
a person who does not believe in the existence of a supreme being or beings.
-
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:
More than 160 of the 940-plus punished officials—or over one in six—were cited for engaging in superstitious activities and beliefs, which the officially atheist Communist Party prohibits for its members.
From The Wall Street Journal ● Jun. 17, 2026
Lou assumes her husband is an atheist and doesn’t understand when she discovers a Bible in the house.
From Los Angeles Times ● Nov. 18, 2025
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
Despite being ruled by the atheist Chinese Communist Party, China has a sizeable Christian population.
From BBC ● Oct. 15, 2025
A lover of men, not women, and an atheist, he used the device of space travel to criticize everything he disliked about the real world.
From "The Invention of Science" by David Wootton
“I know people of faith will watch the show, but I also know that atheists watch the show and like it. To me, that’s the broadest possible audience.”
From The Wall Street Journal ● Nov. 28, 2025
You can see the evidence yourself: On social media, people are making teary videos professing to have rediscovered Jesus; in the comments, former atheists share stories of finding peace and purpose in prayer.
From Slate ● Oct. 1, 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
“Some were deists, some were atheists, but the majority were Christians. I’m also not saying that non-Christians shouldn’t have the same rights as Christians in our country.”
From Seattle Times ● Feb. 17, 2024
We have Christians, Muslims, and atheists among us.
From "X: A Novel" by Ilyasah Shabazz
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.
