/ Dictionary / Index E Eusebius: Meaning and Definition of Find definitions for: Eu•se•bi•us Pronunciation: (y-sē'bē-us), [key] — n. pope a.d. 309 or 310. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: eusebius (Thesaurus) -euse, Eusebius of Caesarea Related Content Daily Word Quiz: serendipity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language