A description of an event or system that is considered to be accurate.
A coherentstatement or set of ideas that explainsobservedfacts or phenomena and correctly predicts new facts or phenomena not previously observed, or which sets out the laws and principles of something known or observed; a hypothesis confirmed by observation, experiment etc.
The underlying principles or methods of a given technical skill, art etc., as opposed to its practice.
A set of axioms together with all statementsderivable from them; or, a set of statements which are deductively closed. Equivalently, a formal language plus a set of axioms (from which can then be derived theorems). The statements may be required to all be bound (i.e., to have no free variables).
From Middle French théorie, from Late Latin theōria, from Ancient Greek θεωρία, from θεωρέω, from θεωρός, from θέα + ὁράω [i. e. θέαν ὁράω (théan horáō, “see, look at a view; survey + genitive”)].
Modern English dictionary
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