/ Thesaurus / X Synonyms of xci Find synonyms for: Adjective1. ninety-one, 91, xci, cardinal (vs. ordinal)usage: being one more than ninetyWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: hedonist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language