• A period of ten years. [from 17th c.]
  • (physics, engineering) The interval between any two quantities having the ratio 10 to 1.

    "There are decades between 1.8 and 18, between 25 and 250 and between 0.03 and 0.003."

  • A series or group of ten things. [from 16th c.]

    "a decade of soldiers"

  • (Roman Catholicism) A series of ten Hail Marys in the rosary.
  • (French historical) In the French Revolutionary calendar, a group of ten days. [from 18th c.]

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