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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. A period of ten years.
  2. n. A group or series of ten.

Century Dictionary and Cyclopedia

  1. n. See decad.

Wiktionary

  1. n. A period of ten years.
  2. n. Specifically, a period of ten years, beginning on January 1 of a year ending with a zero when written, and ending at midnight on December 31 of the year nine years later.
  3. n. Any series of ten items.
  4. n. A series of ten Hail Marys in the rosary.
  5. n. The interval between any two quantities having the ratio 10 to 1.

GNU Webster's 1913

  1. n. A group or division of ten; esp., a period of ten years; a decennium

WordNet 3.0

  1. n. a period of 10 years
  2. n. the cardinal number that is the sum of nine and one; the base of the decimal system

Etymologies

  1. Middle English, a group of ten, from Old French, from Late Latin decas, decad-, from Greek dekas, from deka, ten; see dekm̥ in Indo-European roots.

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‘decade’ has been looked up 1509 times, loved by 1 person, added to 14 lists, commented on 2 times, and has a Scrabble score of 10.