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Definition of Undecennial
1. a. Occurring or observed every eleventh year; belonging to, or continuing, a period of eleven years; undecennary; as, an undecennial festival.
2. a. Occurring or observed every eleventh year; belonging to, or continuing, a period of eleven years; undecennary; as, an undecennial festival.
Definition of Undecennial
1. Adjective. Occurring or observed every eleventh year. ¹
¹ Source: wiktionary.com