Breadcrumb Home > Thesaurus > T Synonyms of thirty Find synonyms for: Noun 1. thirty, 30, XXX, large integer usage: the cardinal number that is the product of ten and three Adjective 1. thirty, 30, xxx, cardinal (vs. ordinal) usage: being ten more than twenty WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of thirty (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 12 Steps to a New Year New Year's Resolution to Slim Down? Martin Luther King Speeches Books of the Bible: Old Testament Books in Order ✖ Related Content Daily Word Quiz: agitprop Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language