millennium

From Wiktionary

[change] Pronunciation

• IPA: /mɪˈlɛnɪəm/

[change] Noun

Singular millennium

Plural millenniums

Singular millennium

Plural millennia

1. A millennium is a period of time lasting one thousand years.

   Mankind invented the first writing systems a few millennia ago.

   Lots of animal species have disappeared during the last millennium.