/ Thesaurus / X Synonyms of xix Find synonyms for: Noun1. nineteen, 19, XIX, large integerusage: the cardinal number that is the sum of eighteen and oneAdjective1. nineteen, 19, xix, cardinal (vs. ordinal)usage: being one more than eighteenWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: circumspect Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language