/ Thesaurus / X Synonyms of xxviii Find synonyms for: Noun1. twenty-eight, 28, XXVIII, large integerusage: the cardinal number that is the sum of twenty-seven and oneAdjective1. twenty-eight, 28, xxviii, cardinal (vs. ordinal)usage: being eight more than twentyWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: reticent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language