/ Dictionary / Index F fast-moving: Meaning and Definition of Find definitions for: fast-mov•ing Pronunciation: (fast'm'ving, fäst'-), [key] — adj. moving or capable of moving at high speed. (of a novel, play, or the like) having sustained action and interest with events following one another rapidly; lively in plot. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. fast motion fastness Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language