millenarianism

/mɪlɪˈnɛəɹɪənɪzəm/

IPA: /M IH1 L IH0 N EH1 R IY0 AH0 N IH0 Z AH0 M/

noun
  1. 1

    A belief in a coming religious millennium, especially 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.

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Source: https://en.wiktionary.org/wiki/millenarianism