A diocese is the district or see under the supervision of a bishop. It is divided into parishes.

An archdiocese is more significant than a diocese. An archdiocese is presided over by an archbishop whose see may have or had importance due to size or historical significance. The archbishop may have metropolitan authority over any other (then 'suffragan') bishops and their dioceses within his ecclesiastical province.

This structure of church governance is known as episcopal polity.

A diocese also may be referred to as a bishopric or episcopal see, though strictly the term episcopal see refers to the domain of ecclesiastical authority officially held by the bishop, and the term bishopric to the post of being bishop.

The bishops, Greek: Episkopos, elders or overseers, of the long-established churches claim Apostolic succession, a direct historical lineage dating back to the original Twelve Apostles.
The word diocese is from the Greek term διοίκησις, meaning "administration".

Read more about Diocese:  Catholic Church, Eastern Orthodox Church, Church of England and Anglican Communion, History

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