/ Thesaurus / P Synonyms of presupposition Find synonyms for: Noun1. presupposition, supposition, supposalusage: the act of presupposing; a supposition made prior to having knowledge (as for the purpose of argument)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language