/ Dictionary / Index B Boniface IV: Meaning and Definition of Find definitions for: Boniface IV Pronunciation: [key] pope a.d. 608–615. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Boniface III Boniface V Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language