/ Thesaurus / X Synonyms of xii Find synonyms for: Noun1. twelve, 12, XII, dozen, large integerusage: the cardinal number that is the sum of eleven and oneAdjective1. twelve, 12, xii, dozen, cardinal (vs. ordinal)usage: denoting a quantity consisting of 12 items or unitsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: benevolent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language