/ Dictionary / Index F fifty-five: Meaning and Definition of Find definitions for: fif•ty-five Pronunciation: (fif'tē-fīv'), [key] — n. a cardinal number, 50 plus 5. a symbol for this number, as 55 or LV. a set of this many persons or things. —adj. amounting to 55 in number. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: fifty-five (Thesaurus) fifty-first fifty-four Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language