Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of undecennial is as below...

Undecennary :: Undecennary (a.) Occurring once in every period of eleven years; undecennial.

Undecennial :: Undecennial (a.) Occurring or observed every eleventh year; belonging to, or continuing, a period of eleven years; undecennary; as, an undecennial festival..

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