/ Dictionary / Index J John XVIII: Meaning and Definition of Find definitions for: John XVIII Pronunciation: [key] (Fasanus) died 1009, Italian ecclesiastic: pope 1003–09. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. John XVII John XIX Related Content Daily Word Quiz: illegible Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language