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 decennial is as below...

Decennial :: Decennial (a.) Consisting of ten years; happening every ten years; as, a decennial period; decennial games..

Duodecennial :: Duodecennial (a.) Consisting of twelve years.

Decennial :: Decennial (n.) A tenth year or tenth anniversary.

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

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

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