Half a millennium is called a "half-millennium" and consists of 500 years. The term "millennium" typically refers to a period of 1,000 years, so half of that would logically be 500 years.
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The singular is "millenium"; "millenia" is the plural. "Millenium" means a thousand years.
1000000 years
1000
there are 12,ooo months in a millenium. decade = 10 years Century= 100 years Millenium= 1000 years
IOOO years and you can remember it by thinking a millenium is a long word and IOOO is a long number.