millenarianism

noun

1. (countable, uncountable)A belief in a coming religious millennium, especially (Christianity) the belief in a coming thousand-year reign of peace heralded by the Second Coming of Christ; utopianism, belief in a coming era of peace and prosperity.

   “It is hard to say for certain just why this brief but notable shift from passive to active millenarianism should have occurred during the Interregnum.”

   “When Herman Melvilled visited , he was fascinated yet repulsed by the 'contagion' of American Christian millenarianism – 'this preposterous Jewmania', he called it, 'half-melancholy, half-farcical'.”