Undecennary

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This word is not acceptable for play in the US & UK dictionaries that are being used in the following games:

Wiktionary, Creative Commons Attribution/Share-Alike License
  • adj. Once every eleven years; undecennial.
  • the GNU version of the Collaborative International Dictionary of English
  • adj. Occurring once in every period of eleven years; undecennial.
  • The Century Dictionary and Cyclopedia
  • Eleventh; occurring once in every period of eleven years.
  • Word Usage
    "Cool word of the day: undecennary, which means "a period of eleven years" or "an eleventh anniversary.""
    Synonym
    Words with the same meaning