/ Dictionary / Index P Philip III: Meaning and Definition of Find definitions for: Philip III Pronunciation: [key] 1578–1621, king of Spain 1598–1621 (son of Philip II of Spain). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Philip II Philip IV Related Content Daily Word Quiz: exemplary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language