/ Dictionary / Index J John III: Meaning and Definition of Find definitions for: John III Pronunciation: [key] (Catelinus) died a.d. 574, Italian ecclesiastic: pope 561–574. (John Sobieski) 1624–96, king of Poland 1674–96. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. John II John IV Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language