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n. pl. bi·mil·len·ni·ums or bi·mil·len·ni·a (-lĕn′ē-ə)
1. A span of 2,000 years.
2. A 2,000th anniversary.

bi′mil·len′ni·al adj.
bi′mil·len′ni·al·ly adv.


a period of two thousand years


(ˌbaɪ mɪˈlɛn i əm)

also bimillenary

n., pl. -len•ni•ums, -len•ni•a (-ˈlɛn i ə)
1. a period of two thousand years.
2. a two-thousandth anniversary.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.bimillennium - the 2000th anniversary (or the celebration of it)bimillennium - the 2000th anniversary (or the celebration of it)
anniversary, day of remembrance - the date on which an event occurred in some previous year (or the celebration of it)
2.bimillennium - a span of 2000 yearsbimillennium - a span of 2000 years      
period, period of time, time period - an amount of time; "a time period of 30 years"; "hastened the period of time of his recovery"; "Picasso's blue period"