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    theory - Dictionary definition and meaning for word theory

    (noun) a well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena
    Example Sentence
    • theories can incorporate facts and laws and tested hypotheses
    • true in fact and theory
    (noun) a tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena
    Synonyms : hypothesis , possibility
    Example Sentence
    • a scientific hypothesis that survives experimental testing becomes a scientific theory
    • he proposed a fresh theory of alkalis that later was accepted in chemical practices
    (noun) a belief that can guide behavior
    Example Sentence
    • the architect has a theory that more is less
    • they killed him on the theory that dead men tell no tales
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