'Deca' is '10' in Latin.
More specifically, 'Decade' means a period of ten years'.
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Ten There are ten years in a decade.
Ten years is a decade
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The period of ten years is called a decade. A decade consists of ten consecutive years, typically numbered from a specific starting point. This term is commonly used in various contexts such as history, economics, and demographics to refer to a specific timeframe of ten years.
a decade is ten years. 2 fifths is the same as 4 tenths.4 years