/ Dictionary / Index F fifty-three: Meaning and Definition of Find definitions for: fif•ty-three Pronunciation: (fif'tē thrē'), [key] — n. a cardinal number, 50 plus 3. a symbol for this number, as 53 or LIII. a set of this many persons or things. —adj. amounting to 53 in number. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: fifty-three (Thesaurus) fifty-third fifty-two Related Content Daily Word Quiz: dissonant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language