/ Thesaurus / O Synonyms of one third Find synonyms for: Noun1. one-third, third, tierce, common fraction, simple fractionusage: one of three equal parts of a divisible whole; "it contains approximately a third of the minimum daily requirement"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language