/ Dictionary / Index J jumpmaster: Meaning and Definition of Find definitions for: jump•mas•ter Pronunciation: ( jump'mas"tur, -mä"stur), [key] — n. a person who supervises the jumping of paratroopers or other parachutists. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. jump line jump-off 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