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Webster 1828 Edition

Noun.

The tenets of Montanus.

Montanism ‎(uncountable)

(Christianity) The doctrines of a heretical sect of the second to fifth centuries in Asia Minor, who held millenarian beliefs.
- 2009, Diarmaid MacCulloch, A History of Christianity, Penguin 2010, p. 138:
  The disappearance of charismatic wandering Christian teachers or prophets and the assertion of the authority of bishops were probably sealed by the Catholic Church's confrontation in the later second century with a movement known as Montanism or ‘the New Prophecy’.

the doctrines of a heretical sect of the second to fifth centuries in Asia Minor, who held millenarian beliefs