Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun supposition

3 senses of supposition

Sense 1
guess, conjecture, supposition, surmise, surmisal, speculation, hypothesis -- (a message expressing an opinion based on incomplete evidence)
       => opinion, view -- (a message expressing a belief about something; the expression of a belief that is held with confidence but not substantiated by positive knowledge or proof; "his opinions appeared frequently on the editorial page")

Sense 2
assumption, supposition, supposal -- (a hypothesis that is taken for granted; "any society is built upon certain assumptions")
       => 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")

Sense 3
supposition, supposal -- (the cognitive process of supposing)
       => conjecture -- (reasoning that involves the formation of conclusions from incomplete evidence)