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