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Word of the Day Tuesday, June 9, 2026

theory

/ˈθɪəri/ noun · British & US
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What does theory mean?

noun

A supposition or a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained. A proposed explanation for a phenomenon.

Example

"The new theory of relativity revolutionized our understanding of space and time."

Definition generated by AI and curated by RJS Tech Solutions LLP.

Synonyms for theory

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Etymologically related