Unit that represents the concept of a decade. For the ISO calendar system, it is equal to 10 years. !(p) When used with other calendar systems it must correspond to an integral number of days and is normally an integral number of years.
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Unit that represents the concept of a decade. For the ISO calendar system, it is equal to 10 years. !(p) When used with other calendar systems it must correspond to an integral number of days and is normally an integral number of years.