theory (nom)
Sens 1 : the analysis of a set of facts in their relation to one another. [source : MW]
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Sens 2 : an abstract thought: speculation. [source : D'après MW]
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Sens 3 : the general or abstract principles of a body of fact, a science, or an art. [source : MW]
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Sens 4 : a belief, policy, or procedure proposed or followed as the basis of action. [source : MW]