Source : Webster's Revised Unabridged Dictionary (1913)

Diocese \Di"o*cese\, n.; pl. {Dioceses}. [OE. diocise, OF.
   diocise, F. dioc['e]se, L. dioecesis, fr. Gr. ? housekeeping,
   administration, a province, a diocese, fr. ? to keep house,
   manage; dia` through + ? to manage a household, ? a house.
   See {Economy}.] (Eccl.)
   The circuit or extent of a bishop's jurisdiction; the
   district in which a bishop exercises his ecclesiastical
   authority. [Frequently, but improperly, spelt {diocess}.]

Source : WordNet®

diocese
     n : the territorial jurisdiction of a bishop [syn: {bishopric}]