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triennium
The largest in magnitude is a triennium, which is 3000 years. The order, from smallest to largest is:Quarter - 3 monthsAnnum - 1 yearDecade - 10 yearsCentury - 100 yearsMillenium - 1000 yearsTriennium - 3000 years
10 years is called a decade hence it is only a decade not decade of years
one decade is 10 years, one decade is 3650 days
A decade is 10 years. Since there are 12 months in a year, a decade will have 120 months.