A decade is a period of ten years.
It comes from French “décade” and Latin “decas,” from Greek “dekas,” meaning “a group of ten,” from “deka,” “ten.” The root “dec-” shows up in many ten-related words.
Once you know “dec-” means ten, words like “decimal” and “decathlon” start making instant sense. A decade is just a “ten-pack” of years bundled together by history and culture.
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