/ Dictionary / Index F fastball: Meaning and Definition of Find definitions for: fast•ball Pronunciation: (fast'bôl", fäst'-), [key] — n. Baseball. a pitch thrown at or near a pitcher's maximum velocity. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: fastball (Thesaurus) fastback fast break Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language