Usually means: Occurring once every eleven years.
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We found 9 dictionaries that define the word undecennial:

General (9 matching dictionaries)
  1. undecennial: Wordnik
  2. undecennial: Wiktionary
  3. Undecennial: Dictionary.com
  4. Undecennial: Online Plain Text English Dictionary
  5. undecennial: Webster's Revised Unabridged, 1913 Edition
  6. Undecennial: AllWords.com Multi-Lingual Dictionary
  7. undecennial: FreeDictionary.org
  8. undecennial: The Phrontistery - A Dictionary of Obscure Words
  9. Undecennial: TheFreeDictionary.com

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Definitions from Wiktionary (undecennial)

▸ adjective:  Occurring or observed every eleventh year.

Similar:
undecennary, decennial, duodecennial, octennial, quindecennial, vicennial, bicentennial, decennal, decamillennial, quadranscentennial, more...

Opposite:
decennial, ten-yearly, decade-long

▸ Words similar to undecennial

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Similar:
undecennary, decennial, duodecennial, octennial, quindecennial, vicennial, bicentennial, decennal, decamillennial, quadranscentennial, more...

Opposite:
decennial, ten-yearly, decade-long



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