A millennium is a period of one thousand years. People often talk about millenniums when marking big historical time spans or celebrating the start of a new thousand-year period.
From Latin ‘mille’ meaning ‘thousand’ and ‘annus’ meaning ‘year.’ It entered English in the 1600s, often in religious discussions about a thousand-year reign or era.
When people worried about the ‘Y2K bug,’ they were really anxious about the shift into a new millennium of computer dates. Thinking in millenniums reminds us how tiny a human lifetime is compared to long stretches of history.
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