Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Relating to or lasting for ten years.
  • adj. Occurring every ten years.
  • n. A tenth anniversary.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The tenth anniversary of an event or happening.
  • adj. Occurring every ten years.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Consisting of ten years; happening every ten years
  • n. A tenth year or tenth anniversary.

from The Century Dictionary and Cyclopedia

  • Continuing for ten years; consisting of ten years: as, a decennial period.
  • Occurring every ten years: as, decennial games.
  • n. A decennial anniversary.
  • n. A celebration of a decennial anniversary.

Etymologies

From Latin decennium, a period of ten years; see decennium.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin decennialis, French decem ten + ennius year- -ly (Wiktionary)

Examples

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