/ Dictionary / Index T twenty-eight: Meaning and Definition of Find definitions for: twen•ty-eight Pronunciation: (twen'tē-āt', twun'-), [key] — n. a cardinal number, 20 plus 8. a symbol for this number, as 28 or XXVIII. a set of this many persons or things. —adj. amounting to 28 in number. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: twenty-eight (Thesaurus) twenty twenty-eighth Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language