(definition) by Webster 1913 Wed Dec 22 1999 at 4:04:42

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.

 

© Webster 1913.

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