1. (noun) hypothesis
a proposal intended to explain certain facts or observations
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) guess, conjecture, supposition, surmise, surmisal, speculation, hypothesis
a message expressing an opinion based on incomplete evidence
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Definition of 'hypothesis' 
