/ Dictionary / Index J John X: Meaning and Definition of Find definitions for: John X Pronunciation: [key] died a.d. 929?, Italian ecclesiastic: pope 914–928. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. John IX John XI Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language