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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.

State wildlife officials have finally come up with a theory to explain where a giant, highly destructive rodent that’s been terrorizing California came from: Oregon.

From Los Angeles Times • Apr. 10, 2026

Notice that at the lows of the double bottom base, round number theory came into play with a bullish morning star completed in February 2025 and a bullish engulfing candle in August 2025.

From Barron's • Apr. 9, 2026

They have not yet been directly observed, but they are predicted by theory.

From Science Daily • Apr. 8, 2026

Combined, this gives you roughly $40,000 a year before taxes — but you don’t have those Big Apple expenses and, in theory, you will have more than $700,000 in five years’ time.

From MarketWatch • Apr. 8, 2026

In theory the Vanguard should have made it into orbit.

From "Reaching for the Moon" by Katherine Johnson




Vocabulary lists containing theory