/ Dictionary / Index J jump seat: Meaning and Definition of Find definitions for: jump' seat" Pronunciation: [key] a movable or folding seat, as in a carriage, taxicab, or limousine, used as an extra seat. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. jump rope jump-shift Related Content Daily Word Quiz: morose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language