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theoryMain Entry: the·o·ry Pronunciation: \ˈthē-ə-rē, ˈthir-ē\ Function: noun Etymology: Late Latin theoria, from Greek theōria, from theōrein Inflected Forms: plural the·o·ries Date: 1592 1 : the analysis of a set of facts in their relation to one another 2 : abstract thought : speculation 3 : the general or abstract principles of a body of fact, a science, or an art <music theory> 4 a : a belief, policy, or procedure proposed or followed as the basis of action <her method is based on the theory that all children want to learn> 5 : a plausible or scientifically acceptable general principle or body of principles offered to explain phenomena <the wave theory of light> 6 a : a hypothesis assumed for the sake of argument or investigation
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