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From The Collaborative International Dictionary of English v.0.48:
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.] [1913 Webster]