/ Dictionary / Index T twenty-ninth: Meaning and Definition of Find definitions for: twen•ty-ninth Pronunciation: (twen'tē-nīnth', twun'-), [key] — adj. next after the twenty-eighth; being the ordinal number for 29. being one of 29 equal parts. —n. a twenty-ninth part, esp. of one (). the twenty-ninth member of a series. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: twenty-ninth (Thesaurus) twenty-nine twenty-one Related Content Daily Word Quiz: cur Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language