/ Dictionary / Index S sixty-three: Meaning and Definition of Find definitions for: six•ty-three Pronunciation: (siks'tē-thrē'), [key] — n. a cardinal number, 60 plus 3. a symbol for this number, as 63 or LXIII. a set of this many persons or things. —adj. amounting to 63 in number. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sixty-three (Thesaurus) sixty-third sixty-two Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language