- noun a possible explanation of how or why something happens which has not been confirmed by experimental evidence
- A set of statements, concepts, principles, and/or rules whose intention is to explain and/or predict phenomena using logical and scientific arguments. Examples include quantum theory, the Bardeen-Cooper-Schrieffer theory, and the Grand Unified Theory.
- A branch of science in which a theory (1) is applied, as opposed to practice. Examples include circuit theory, and information theory.
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