A millennium (pl. millennia or millenniums) is a period of one thousand years, one hundred decades, or ten centuries, [1][2] It is also sometimes called a kiloannum (ka) or kiloyear (ky).

Since in Latin mille means "thousand", a millennium lasts 1,000 years. Thus, we're living today at the beginning of the third millennium since the birth of Christ.

Definition of millennium noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

A millennium is a period of one thousand years, especially one which begins and ends with a year ending in '000', for example the period from the year 1000 to the year 2000.

MILLENNIUM definition: 1. a period of 1,000 years, or the time when a period of 1,000 years ends: 2. the beginning of a…. Learn more.

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