Bible Dictionaries
Undecennial

Webster's Dictionary

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

Bibliography Information
Webster, Noah. Entry for 'Undecennial'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​u/undecennial.html. 1828.