Definitions for undecennial
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Wiktionary
undecennial(Adjective)
Occurring or observed every eleventh year.
an undecennial festival
Webster Dictionary
Undecennial(adj)
occurring or observed every eleventh year; belonging to, or continuing, a period of eleven years; undecennary; as, an undecennial festival
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"undecennial." Definitions.net. STANDS4 LLC, 2013. Web. 18 Jun 2013. <http://www.definitions.net/definition/undecennial>.

