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
Synonyms: possibility, hypothesis
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
Synonyms: theory, possibleness, surmisal, hypothesis, possibility, opening, guess, conjecture, possible action, supposition, surmise, speculation
3. (noun) theory
a belief that can guide behavior
Synonyms: possibility, hypothesis
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Synonyms and Antonyms of theory 
