undecennary


From The Collaborative International Dictionary of English v.0.48:

Undecennary \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.
   [1913 Webster]

         An undecennary account laid before Parliament. --E.
                                                  Stiles.
   [1913 Webster]
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