Usually means: Relating to a period of eleven.
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We found 8 dictionaries that define the word undecennary:

General (8 matching dictionaries)
  1. undecennary: Wordnik
  2. undecennary: Wiktionary
  3. Undecennary: Dictionary.com
  4. Undecennary: Online Plain Text English Dictionary
  5. undecennary: Webster's Revised Unabridged, 1913 Edition
  6. Undecennary: AllWords.com Multi-Lingual Dictionary
  7. undecennary: FreeDictionary.org
  8. Undecennary: TheFreeDictionary.com

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Definitions from Wiktionary (undecennary)

▸ adjective:  (rare) Once every eleven years; undecennial.

Similar:
undecennial, duodecennial, decennial, decennal, decennalian, quindecennial, decennary, undecillionth, octennial, vigintennial, more...

Opposite:
decennial, ten-year, decade

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Similar:
undecennial, duodecennial, decennial, decennal, decennalian, quindecennial, decennary, undecillionth, octennial, vigintennial, more...

Opposite:
decennial, ten-year, decade



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