Breadcrumb Home > Thesaurus > O Synonyms of one ninth Find synonyms for: Noun1. one-ninth, ninth, common fraction, simple fractionusage: one part in nine equal partsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. ✖ Related Content Daily Word Quiz: hortatory Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language