Definitions from Wiktionary (millennium)

▸ noun:  A period of time consisting of one thousand years.
▸ noun:  (Christianity) The period of one thousand years during which Christ will reign on earth (according to Millenarianist interpretations).
▸ noun:  (archaic) A period of universal happiness, peace or prosperity; a utopia.
▸ noun:  (with definite article) The year in which one period of one thousand years ends and another begins, especially the year 2000.
▸ Also see millennium

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