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  1. The third millennium is the current millennium in the Common Era, spanning the 21st to 30th centuries. Learn about its history, events, predictions, and futures studies from this comprehensive article.

  2. millennium, a period of 1,000 years. The Gregorian calendar, put forth in 1582 and subsequently adopted by most countries, did not include a year 0 in the transition from bc (years before Christ) to ad (those since his birth). Thus, the 1st millennium is defined as spanning years 1–1000 and the 2nd the years 1001–2000.