Meaning of “millennium” in the English Dictionary

"millennium" in British English

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millenniumnoun [ C ]

uk /mɪˈlen.i.əm/ us /mɪˈlen.i.əm/ plural millennia millenniums

C2 a period of 1,000 years, or the time when a period of 1,000 years ends:

The corpse had lain preserved in the soil for almost two millennia.
Compare
the millennium

the beginning of a new millennium in the year 2000:

How did you celebrate the millennium?

More examples

  • The book is a history of the last two millennia.
  • Imagine what the world will be like at the end of the next millennium.

(Definition of “millennium” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"millennium" in American English

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millenniumnoun [ C ]

us /məˈlen·i·əm/ plural millennia /məˈlen·i·ə/ millenniums

a period of 1000 years:

The area has experienced the worst drought in half a millennium.
millennial
adjective [ not gradable ] us /məˈlen·i·əl/

(Definition of “millennium” from the Cambridge Academic Content Dictionary © Cambridge University Press)