/ Dictionary / Index J JCI: Meaning and Definition of Find definitions for: JCI Pronunciation: [key] Jaycees International. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. J.C.D. JCL 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