The Collaborative International Dictionary of English v.0.48:

Bishopric \Bish"op*ric\, n. [AS. bisceopr[imac]ce; bisceop
   bishop + r[imac]ce dominion. See -ric.]
   1. A diocese; the district over which the jurisdiction of a
      bishop extends.
      [1913 Webster]

   2. The office of a spiritual overseer, as of an apostle,
      bishop, or presbyter. --Acts i. 20.
      [1913 Webster]

WordNet (r) 3.0 (2006):

bishopric
    n 1: the territorial jurisdiction of a bishop [syn: diocese,
         bishopric, episcopate]