Etymology

millenarianism

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Today it means: 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. Full definition →

First used 19th c.
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The story

From millenarian + -ism. Compare millenarism, millennianism, millennialism.

First known use, by meaning

  • from 19th c. 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.

Etymology from Wiktionary, CC BY-SA 4.0.