/ Thesaurus / T Synonyms of twentieth century Find synonyms for: Noun1. twentieth century, centuryusage: the century from 1901 to 2000WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: aversion Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language