1. (noun) guess, conjecture, supposition, surmise, surmisal, speculation, hypothesis
a message expressing an opinion based on incomplete evidence
Synonyms: guess, possibility, conjecture, surmise, guesswork, theory, meditation, venture, supposition, dead reckoning, guessing, surmisal, supposal, assumption, hypothesis, speculation, shot
2. (noun) assumption, supposition, supposal
a hypothesis that is taken for granted
Synonyms: conjecture, supposal, surmisal, hypothesis, presumptuousness, guess, premiss, premise, effrontery, supposition, laying claim, speculation, presumption, surmise, assumption
3. (noun) supposition, supposal
the cognitive process of supposing
Synonyms: supposal, surmisal, hypothesis, conjecture, guess, surmise, supposition, speculation, assumption
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Synonyms and Antonyms of supposition 
