/ Dictionary / Index S sixty-four: Meaning and Definition of Find definitions for: six•ty-four Pronunciation: (siks'tē-fôr', -fōr'), [key] — n. a cardinal number, 60 plus 4. a symbol for this number, as 64 or LXIV. a set of this many persons or things. —adj. amounting to 64 in number. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sixty-four (Thesaurus) sixty-five sixty-four-dollar question Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language