millennium

/mษชหˆlษ›nษชษ™m/
noun
  1. 1

    A period of time consisting of one thousand years.

  2. 2

    The period of one thousand years during which Christ will reign on earth (according to Millenarianist interpretations).

  3. 3

    A period of universal happiness, peace or prosperity; a utopia.

  4. 4

    (with definite article) The year in which one period of one thousand years ends and another begins, especially the year 2000.

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