A decade is a period of ten years, any ten years can be a decade - years 1994 to 2004 is a decade. Decades are often given various tags which help to define that decade and are often, if not always, simplified by being rounded up or down to the nearest tenth. 60's (decade) being tagged with hippies, 70's with disco, 80's hair only to name a few.
People like to ponder as to what the 2010-2020 decade will be known for, what great and likely horrible things that are on the horizon.
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