Source : Webster's Revised Unabridged Dictionary (1913)

Millenarianism \Mil`le*na"ri*an*ism\, Millenarism
\Mil"le*na*rism\, n.
   The doctrine of Millenarians.

Source : WordNet®

millenarianism
     n : belief in the Christian doctrine of the millennium mentioned
         in the Book of Revelations [syn: {millenniumism}, {chiliasm}]