Etymology
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supposition (n.)

early 15c., a term in logic, "assumption, hypothesis," from Medieval Latin suppositionem (nominative suppositio) "assumption, hypothesis, a supposition," noun of action from past participle stem of supponere (see suppose); influenced by Greek hypothesis. In classical Latin, "a putting under, substitution." Earlier in English in the same sense was supposal (late 14c.). Related: Suppositional; suppositionally.

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Definitions of supposition

supposition (n.)
a message expressing an opinion based on incomplete evidence;
Synonyms: guess / conjecture / surmise / surmisal / speculation / hypothesis
supposition (n.)
a hypothesis that is taken for granted;
Synonyms: assumption / supposal
supposition (n.)
the cognitive process of supposing;
Synonyms: supposal
From wordnet.princeton.edu