How long is a Decade and a Century?
Considering a year to be a unit in calculating, one year equals one full rotation around the sun. With a year as one unit, a decade is precisely 10 years, i.e., 10 years equals 1 decade. And a century is similar to 10 decades which in turn is (10*10) = 100 years.
Consequently, these may be expressed as follows:
| 1 year | 365 days. |
|---|---|
| 1 Decade | 10 years. |
| 1 Century | 100 years. |
| Millennium | 1000 years. |
Decade and century come from Latin, where Decuria signifies ten men and Centuria means 100. Saeculum, 100 years, is the origin of Centuria. These words describe a group of people with similar traits across time.