In some forms of Christianity, a diocese's an administrative territorial unit administered by a bishop. It's also referred to as a bishopric or Episcopal Area (as in United Methodism) or episcopal see, though strictly the term episcopal see refers to the domain of ecclesiastical authority officially held by the bishop, and bishopric to the post of being bishop. The diocese's the key geographical unit of authority in the form of church governance known as episcopal polity. In the Roman Catholic… (More on Diocese)