How long is a decade? A decade is a measure of time that is equal to 10 years, 120 months, about 521.785 weeks, or about 3650 days.
The word decade is derived from the word deca meaning 10
When people say from the 1980s, 1970s, or 1990s, they are referring to a decade.
For example, from the 1970s means from 1970 to 1979. From 1970 to 1979, there are ten years.
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