millennium - definition and synonyms

noun [countable] 

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pluralmillennia or millenniums
  1. a period of 1,000 years
    1. a.
      the beginning of a period of 1,000 years

      People celebrating the millennium filled the streets.

    2. b.

      the millennium

      the time when some Christians believe Jesus Christ will return to the world and rule it for 1,000 years