/ Dictionary / Index F fifty-fifth: Meaning and Definition of Find definitions for: fif•ty-fifth Pronunciation: (fif'tē fifth' or, often, -fith'), [key] — adj. next after the fifty-fourth; being the ordinal number for 55. being one of 55 equal parts. —n. a fifty-fifth part, esp. of one (). the fifty-fifth member of a series. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: fifty-fifth (Thesaurus) fifty-eighth fifty-fifty Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language