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A decade is a period of ten years. The term originates from the Greek word "dekatos," meaning tenth. Decades are commonly used to mark significant periods in history, personal lives, and cultural trends. For example, the 1980s refers to the decade from January 1, 1980, to December 31, 1989. In many cultures, specific decades are associated with distinct social, economic, and political characteristics, often summarized by keywords or popular culture references.

Calendrical decades are typically numbered according to the Gregorian calendar. The first decade of the 1st century CE was the years 1-10, the second was 11-20, and so on. Modern usage often refers to decades by their tens digit, such as the "seventies" (1970-1979) or the "nineties" (1990-1999). This convention can sometimes lead to ambiguity, as some might consider the years 1970-1979 as the "seventies" while others might interpret it as the first decade of the 1970s.

The concept of a decade is also used in various fields. In music, a decade can represent a distinct era of popular genres and artists. In economics, economists might analyze trends over decades to identify long-term growth patterns or cyclical behavior. In personal development, people often reflect on their lives in ten-year increments. The term "decade" provides a convenient and widely understood unit for measuring time beyond a single year.