Millennium

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A millennium (plural millennia or millenniums) is a period of one thousand years, sometimes called a kiloyear. Sometimes, 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 (typically the year "1") and at later years that are whole number multiples of a thousand years after the start point. The term can also refer to an interval of time beginning on any date.