The Collaborative International Dictionary of English v.0.48:
Sacerdotalism \Sac`er*do"tal*ism\, n. The system, style, spirit, or character, of a priesthood, or sacerdotal order; devotion to the interests of the sacerdotal order. [1913 Webster]WordNet (r) 3.0 (2006):
sacerdotalism n 1: a belief that priests can act as mediators between human beings and God