/ Thesaurus / S Synonyms of substantiation Find synonyms for: Noun1. confirmation, verification, check, substantiation, proof, cogent evidenceusage: additional proof that something that was believed (some fact or hypothesis or theory) is correct; "fossils provided further confirmation of the evolutionary theory"2. validation, proof, substantiation, determination, findingusage: the act of validating; finding or testing the truth of somethingWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: denizen Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language