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Definitions

rationalist

[rash-uhn-uhl-ist] / ˈræʃ ən əl ɪst /
NOUN
realist
Synonyms




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:

But inside the brain trusts of Silicon Valley, billions of investor dollars and years of tortured rationalist arguments are clouding a similar argument about artificial intelligence.

From Salon ● Sep. 12, 2026

Underneath it all is Roko’s Basilisk, a thought experiment that originated on the online rationalist forum LessWrong and has proved genuinely radicalizing.

From The Wall Street Journal ● Jun. 4, 2026

Jessica Taylor, an artificial intelligence researcher who says she knew several of the group members, told the Associated Press that Lasota and the Zizians stretched their rationalist beliefs to justify breaking laws.

From BBC ● Feb. 20, 2025

His father had been dead for eight years — and he’d been a scientist and a rationalist — but there he was, trying to comfort his son.

From New York Times ● May 21, 2024

On most questions Descartes is a rationalist, but as far as the laws of nature are concerned he appears to want to have it both ways.

From "The Invention of Science" by David Wootton

The young man was part of a loose network called the Zizians: self-proclaimed rationalists who believe a misaligned AI superintelligence could one day torture humanity the way factory farms torture animals.

From The Wall Street Journal ● Jun. 4, 2026

Lasota began blogging using the alias "Ziz", but soon fell out with mainstream rationalists as her writings spun off in bizarre directions.

From BBC ● Feb. 20, 2025

They include atheists, agnostics, the culturally religious but not observant, rationalists and the spiritual but not religious.

From Seattle Times ● Oct. 4, 2023

Called rationalists or effective altruists, this community became enormously influential in academia, government think tanks and the tech industry.

From New York Times ● Jun. 10, 2023

The existence of this romantic tendency constitutes at least a small part of the emotional makeup of most mathematicians, and is perhaps surprising to those who think of mathematicians as cold rationalists.

From "Innumeracy: Mathematical Illiteracy and Its Consequences" by John Allen Paulos


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