/ Dictionary / Index P Pius V: Meaning and Definition of Find definitions for: Pius V Pronunciation: [key] (Michele Ghislieri), 1504–72, Italian ecclesiastic: pope 1566–72. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Pius IV Pius VI Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language