The Collaborative International Dictionary of English v.0.48:

Episcopal \E*pis"co*pal\, a. [L. episcopalis, fr. episcopus: cf.
   F. ['e]piscopal. See Bishop.]
   1. Governed by bishops; as, an episcopal church.
      [1913 Webster]

   2. Belonging to, or vested in, bishops; as, episcopal
      jurisdiction or authority; the episcopal system.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Episcopal
    adj 1: of or pertaining to or characteristic of the Episcopal
           church; "the Episcopal hierarchy"; "married by an
           Episcopalian minister" [syn: Episcopal, Episcopalian]
    2: denoting or governed by or relating to a bishop or bishops
       [syn: episcopal, pontifical]

Moby Thesaurus II by Grady Ward, 1.0:

21 Moby Thesaurus words for "episcopal":
   abbatial, abbatical, archiepiscopal, canonical, capitular,
   capitulary, churchly, clerical, ecclesiastic, episcopalian,
   evangelistic, ministerial, pastoral, prelatial, prelatic,
   priest-ridden, priestish, priestly, rabbinic, sacerdotal,
   ultramontane