Source : Webster's Revised Unabridged Dictionary (1913)

Episcopate \E*pis"co*pate\, v. i. [imp. & p. p. {Episcopated};
   p. pr. & vb. n. {Episcopating}.]
   To act as a bishop; to fill the office of a prelate. [Obs.]

         Feeding the flock episcopating.          --Milton.