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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 Indictions (in) is equal to 7.25328E+15 seconds, while 1 Decades (dec) = 315400000 seconds.| 21 Indictions | to common time units |
|---|---|
| 21 in | = 1.5231888E+17 seconds (s) |
| 21 in | = 2.538648E+15 minutes (min) |
| 21 in | = 42310800000000 hours (hr) |
| 21 in | = 1762950000000 days (day) |
| 21 in | = 251850000000 weeks (wk) |
| 21 in | = 4830000000 years (yr) |
| 21 in | = 57960000000 months (mo) |
| 21 in | = 482938744.45149 decades (dec) |
| 21 in | = 48293874.445149 centuries (cent) |
| 21 in | = 4829387.4445149 millenniums (mill) |