1. 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 (synset 105998364)
    "theories can incorporate facts and laws and tested hypotheses"; "true in fact and theory"
  2. A tentative insight into the natural world;
    A concept that is not yet verified but that if true would explain certain facts or phenomena (synset 105897536)
    "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"
  3. A belief that can guide behavior (synset 105961846)
    "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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