Source : Webster's Revised Unabridged Dictionary (1913)

Priesthood \Priest"hood\, n.
   1. The office or character of a priest; the priestly
      function. --Bk. of Com. Prayer.

   2. Priests, taken collectively; the order of men set apart
      for sacred offices; the order of priests.

Source : WordNet®

priesthood
     n : the body of ordained religious practitioners