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A decade is a period of 10 years. The word is derived from the Ancient Greek: δεκάς (transliteration=dekas), which means a group of ten. Other words for spans of years also c ..more definition+
In relation to the base unit of [time] => (seconds), 1 Decades (dec) is equal to 315400000 seconds, while 1 Leap Years (ly) = 31622400 seconds.| 21 Decades | to common time units |
|---|---|
| 21 dec | = 6623400000 seconds (s) |
| 21 dec | = 110390000 minutes (min) |
| 21 dec | = 1839833.3333333 hours (hr) |
| 21 dec | = 76659.722222222 days (day) |
| 21 dec | = 10951.388888889 weeks (wk) |
| 21 dec | = 210.02663622527 years (yr) |
| 21 dec | = 2520.3196347032 months (mo) |
| 21 dec | = 21 decades (dec) |
| 21 dec | = 2.1 centuries (cent) |
| 21 dec | = 0.21 millenniums (mill) |