The Collaborative International Dictionary of English v.0.48:
Millenarianism \Mil`le*na"ri*an*ism\, Millenarism \Mil"le*na*rism\, n. The doctrine of Millenarians. [1913 Webster]WordNet (r) 3.0 (2006):
millenarism n 1: belief in the Christian doctrine of the millennium mentioned in the Book of Revelations [syn: millenarianism, millenarism, millenniumism, chiliasm]