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For other uses, see Decade (disambiguation).

A decade is the time between ten orbits around the Sun by the Earth; in other words, it is a period of ten years. The word is derived from the Latin words decem (ten) and annus (year).

The word can be used to specify a general periode of ten years, for example "The last decade was characterized by the rise of the Internet". A decade may also be a well-defined historical periode of ten years in a dating system. In that sense, the first decade of the 20th century indicates a period from January 1, 1901 till December 31, 1910.

For a list of decades, see list of decades.

See also

• Time
• deka-annum/deca-annum/decka-annum (Da/da/daa/dka) - 10e1 years (annum)