This word is acceptable for play in the UK dictionary that is being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. Millenary doctrine or belief; millenarianism.

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

"Because of this, peasant movements would often express themselves in a form of religious millenarism c.f. the Peasant War in Germany or the Diggers and Levellers in 17th century England which would act as a substitute for the political and economic homogeneity that they so desperately lacked."

theological doctrine   

millenarian