Regional; of or relating to a region, especially an ecclesiastical region; specifically (chiefly Roman History) of or relating to one of the regions into which ancient Rome was divided.
Recorded earliest in regionary bishop.
1historical In the early church: a cleric or lay official attached to one of the ecclesiastical regions of Rome, especially one with responsibility for the secular affairs of the region.
Either of two 4th-cent. documents giving an account or description of the regions into which the city of Rome was divided.
Mid 17th century; earliest use found in Henry Hammond (1605–1660), Church of England clergyman and theologian. From post-classical Latin regionarius (of a deacon or subdeacon) that is at the head of one of the seven wards of Rome from classical Latin regiōn-, regiō + -ārius.