/ Dictionary / Index D diocese: Meaning and Definition of Find definitions for: di•o•cese Pronunciation: (dī'u-sis, -sēz", -sēs"), [key] — n. an ecclesiastical district under the jurisdiction of a bishop. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: diocese (Thesaurus) diocesan Diocletian Related Content Daily Word Quiz: reclusive Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language