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Definition of millennium
noun (plural millennia /-ˈlenēə/ or millenniums)
1a period of a thousand years, especially when calculated from the traditional date of the birth of Christ.
) Christian Theology the prophesied thousand-year reign of Christ at the end of the age (Rev. 20:1-5).
) a utopian period of good government, great happiness, and prosperity.
2an anniversary of a thousand years:the millennium of the Russian Orthodox Church
) the point at which one period of a thousand years ends and another begins.
with a double l
and a double n
. The plural can be spelled either millennia
(like the original Latin) or millenniums