/ Dictionary / Index J jg: Meaning and Definition of Find definitions for: jg Pronunciation: [key] junior grade. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. JFK jhāna Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language