/ Dictionary / Index J JP: Meaning and Definition of Find definitions for: JP Pronunciation: [key] jet propulsion. Justice of the Peace. J.P. Pronunciation: [key] Justice of the Peace. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. joystick J particle Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language