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Definitions

theory

[thee-uh-ree, theer-ee] / ˈθi ə ri, ˈθɪər i /


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.

Neither of them made any substantive changes to core Roman Catholic doctrine, but when you’re the bishop of Rome and the head of the world’s largest single religious denomination, practice matters more than theory.

From Salon • Apr. 5, 2026

The philosophical bent of Palantir came from Karp, who holds a Ph.D. in neoclassical social theory from Goethe University Frankfurt in Germany.

From MarketWatch • Apr. 4, 2026

"By combining theory with our experimental ability to precisely control surface terminations, we open a new path toward MXenes with improved stability and tailored functional properties," concludes Ghorbani-Asl.

From Science Daily • Apr. 4, 2026

“There’s this huge game theory incentive to be the first one to leave versus stick around, even if you think the fundamentals are fine,” said Brian Jacobs, a portfolio manager at Aptus Capital Advisors.

From The Wall Street Journal • Apr. 2, 2026

Because of this theory, stealing art became different from other sorts of stealing.

From "The Mona Lisa Vanishes" by Nicholas Day