/ Dictionary / Index S Sergius II: Meaning and Definition of Find definitions for: Sergius II Pronunciation: [key] dieda.d.847, pope 844–847. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Sergius I Sergius III 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