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 Definitions of 'theory':

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1. (noun) theory
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
"theories can incorporate facts and laws and tested hypotheses"; "true in fact and theory"

2. (noun) hypothesis, possibility, theory
a tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena
"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. (noun) theory
a belief that can guide behavior
"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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"theory." Definitions.net. STANDS4 LLC, 2008. 20 July. 2008. http://www.definitions.net/definition/theory
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