Breadcrumb Home > Thesaurus > S Synonyms of supposal Find synonyms for: Noun1. assumption, supposition, supposal, hypothesis, possibility, theoryusage: a hypothesis that is taken for granted; "any society is built upon certain assumptions"2. supposition, supposal, conjectureusage: the cognitive process of supposingWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of supposal (Dictionary) ✖ Related Content Daily Word Quiz: porcine Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language