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English definition of “millennium”

millennium

noun [C]     /mɪˈleniəm/ (plural millennia)
a period of 1000 years, often calculated from the date when Christ is thought to have been bornSpecific periods of timeDecades, centuries and the millennium
the Millennium the change from the year 1999 to 2000 in the Western calendar: Where did you celebrate the Millennium?Specific periods of timeDecades, centuries and the millennium
(Definition of millennium noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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