/ Dictionary / Index T twenty-nine: Meaning and Definition of Find definitions for: twen•ty-nine Pronunciation: (twen'tē-nīn', twun'-), [key] — n. a cardinal number, 20 plus 9. a symbol for this number, as 29 or XXIX. a set of this many persons or things. —adj. amounting to 29 in number. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: twenty-nine (Thesaurus) twentymo twenty-ninth Related Content Daily Word Quiz: winsome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language