Un′de‐cen″na‐ry (?), a. [L. undecim eleven (unus one + decem ten) + -ennary as in decennary. Cf. Undecennial.] Occurring once in every period of eleven years; undecennial.
An undecennary account laid before Parliament. E. Stiles.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.