Meaning & use
millennium
A period of one thousand years, or the moment marking the transition from one such period to the next.
See it in a sentence
Historians still debate how much daily life truly changed across that millennium.
The city held a huge celebration to welcome the new millennium in 2000.
A note on using this word
The plural can be either millennia or millenniums; millennia is more common in formal and academic writing.
Words with a similar meaning
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