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A 'decade' is a set or a group of ten, commonly a period of 10 years in contemporary English, or a period of 10 days in the French revolutionary calendar. The word is derived from the late Latin "decas", from Greek "dekas
★ , from deka.
In contemporary English, the word can be used to specify a general period 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 period of ten years in a dating system. In that sense, the first decade of the 20th century indicates a period from January 1, 1901 until December 31, 1910.

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See also

See also

★ List of decades

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