A millennium (pl. millennia or millenniums) is a period of one thousand years. Normally, the word is used specifically for periods of a thousand years that begin at the starting point (initial reference point) of the calendar in consideration and at later years that are whole number multiples of a thousand years after the start point.
A millennium (pl. millennia or millenniums) is a period of one thousand years. Normally, the word is used specifically for periods of a thousand years that begin at the starting point (initial reference point) of the calendar in consideration and at later years that are whole number multiples of a thousand years after the start point.
Source: Wikipedia "Millennium" · CC BY-SA 4.0
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