Episcopate
From BiblePortal Wikipedia
Webster's Dictionary [1]
(1): ( n.) The collective body of bishops.
(2): ( n.) The time of a bishop's rule.
(3): ( v. i.) To act as a bishop; to fill the office of a prelate.
(4): ( n.) A bishopric; the office and dignity of a bishop.
Cyclopedia of Biblical, Theological and Ecclesiastical Literature [2]
the office of a bishop (q.v.).