noun. The doctrine of or belief in the coming of the millennium; the doctrine of the reappearance of Christ on earth, the establishment of his kingdom, the resurrection of the saints and of the remaining dead for the general judgment, and an intervening period of a thousand years (or of indefinite length) of perfect righteousness.

noun. The doctrine of Millenarians.

noun. A belief that a major change is about to happen, based on 1000-year intervals.

noun. belief in the Christian doctrine of the millennium mentioned in the Book of Revelations

"Another aspect of The Last Man's ambivalence towards millenarianism is seen in two episodes involving religious movements."

millenarism  

theological doctrine