Etymology
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millenarianism

"doctrine of or belief in the coming of the (Christian) millennium," 1800, from millenarian + -ism. A general doctrine in the early Church, it was in disfavor from 4c., but revived in Protestant denominations from 17c. From 1640s in the form millenarism.

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Definitions of millenarianism

millenarianism (n.)
belief in the Christian doctrine of the millennium mentioned in the Book of Revelations;
Synonyms: millenarism / millenniumism / chiliasm
From wordnet.princeton.edu