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.

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.