When Islm entered upon the tenth century of its existence, there was throughout Persia and India a millenarian movement.
She had become deeply impressed with the millenarian fervour which laid hold of so many some twenty-five or thirty years ago.
1550s, "one who believes in the coming of the (Christian) millennium," from Latin millenarius (see millennium) + -ian. As an adjective, "pertaining to the millennium," from 1630s. Related: Millennarianism.