/ Dictionary / Index J JCL: Meaning and Definition of Find definitions for: JCL Pronunciation: [key] — Computers. Computers. See the total specifications made for a job using job control language. J.C.L. Pronunciation: [key] Licentiate in Canon Law. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. JCI J.C.S. Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language