A ecade 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 Republican 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.