Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. A period of ten years; a decade.

Century Dictionary and Cyclopedia

  1. n. A period of ten years.

Wiktionary

  1. n. a period of ten years

GNU Webster's 1913

  1. n. A period of ten years.

WordNet 3.0

  1. n. a period of 10 years

Etymologies

  1. Latin, from decennis, lasting for ten years : decem, ten; see dekm̥ in Indo-European roots + annus, year; see at- in Indo-European roots.

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‘decennium’ has been looked up 1173 times, added to 5 lists, and has a Scrabble score of 14.