1000 years is called a millenium.
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decade:10 years century:100 years millennium:1000 years
10 years is called a decade hence it is only a decade not decade of years
A period of 10 years is called a decade.
A decade (10 years) is one hundredth of a millennium (1000 years).
100 of them because a decade is 10 years and a millennium is a 1000 years