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Noun: bimillennium  ,bI-mi'le-nee-um
  1. The 2000th anniversary (or the celebration of it)
    - bimillenary
     
  2. A span of 2000 years
    - bimillenary

Derived forms: bimillenniums

Type of: anniversary, day of remembrance, period, period of time, time period, time span