/ Dictionary / Index S Sergius I: Meaning and Definition of Find definitions for: Ser•gi•us I Pronunciation: (sûr'jē-us), [key] dieda.d.701, Italian ecclesiastic: pope 687–701. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Sergipe Sergius II 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