Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Relating to or lasting for ten years.
  • adjective Occurring every ten years.
  • noun A tenth anniversary.

from The Century Dictionary.

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

from the GNU version of the Collaborative International Dictionary of English.

  • noun A tenth year or tenth anniversary.
  • adjective Consisting of ten years; happening every ten years

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The tenth anniversary of an event or happening.
  • adjective Occurring every ten years.

Etymologies

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

[From Latin decennium, a period of ten years; see decennium.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin decennialis, French decem ten + ennius year- -ly

Examples

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