/ Thesaurus / O Synonyms of one fifth Find synonyms for: Noun1. one-fifth, fifth, fifth part, twenty percent, common fraction, simple fractionusage: one part in five equal partsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: philanthropy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language