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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 Tropical Years (TY) = 31556925.445 seconds.| 991000 Decades | to common time units |
|---|---|
| 991000 dec | = 312561400000000 seconds (s) |
| 991000 dec | = 5209356666666.7 minutes (min) |
| 991000 dec | = 86822611111.111 hours (hr) |
| 991000 dec | = 3617608796.2963 days (day) |
| 991000 dec | = 516801256.61376 weeks (wk) |
| 991000 dec | = 9911256.9761542 years (yr) |
| 991000 dec | = 118935083.71385 months (mo) |
| 991000 dec | = 991000 decades (dec) |
| 991000 dec | = 99100 centuries (cent) |
| 991000 dec | = 9910 millenniums (mill) |