The throne of a bishop or archbishop in the principal church of a diocese; a cathedra. Now somewhat rare.

A ceremonial chair occupied by a pope or bishop. Hence also: the office or position of Pope or bishop (cf. sense 3a).

The seat of a bishop in his church; hence figurative episcopal dignity or authority. Obsolete or archaic.

The seat or throne of a bishop within the chancel.

Classical Architecture = apsis, n. 3b(a): cf. cathedra, n.

The chair or seat of a bishop in his church; hence, the episcopal see or dignity.