eparchy

Short definition from Wiktionary

Noun

1. 1
   A district of the Roman Empire at the third echelon
2. 2
   A provincial government or office headed by an eparch in the Greek-speaking Eastern Roman Empire (akin to a prefecture governed by a prefect in the Latin-speaking Western Roman Empire)
3. 3
   An administrative sub-provincial unit in post-Ottoman independent Greece.
4. 4
   In pre-schism Christian Church, a province under the supervision of the metropolitan.
5. 5
   In Eastern Christendom, a diocese of a bishop.