1) Bishopric 2) Diocese 3) Pastoral district 4) The diocese of an archbishop 1) Bishopric 2) See 
The chief diocese of an ecclesiastical province.
• (n.) The diocese of an archbishop.
Diocese at the head of a group that forms an ecclesiastical province. While the diocese is governed by a Bishop, Archdiocese are governed by an Archbishop
Arch`di'o·cese noun [ Prefix arch- + diocese .] The diocese of an archbishop. 
[n] - the diocese of an archbishop
archdiocese The see or jurisdiction of an archbishop.
noun the diocese of an archbishop
the diocese of an archbishop.