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Millennium
A millennium is a calendar period of a thousand years or ten centuries.
A calendar year always begins at 1. There is no year zero in the Christian era : it is Anno Domini , which defines the starting point of the Gregorian calendar today. Thus the first millennium of this calendar begins on January 1 of year 1 , the second millennium on 1 January 1001 and the third millennium on January 1, 2001.
In French , the numbers of millennia note usually Roman numerals in small caps.
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