/ Thesaurus / 3 Synonyms of 3rd Find synonyms for: Adjective1. third, 3rd, tertiary, ordinal (vs. cardinal)usage: coming next after the second and just before the fourth in positionWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: acerbity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language