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

Un`de*cen"ni*al (?), a. [See Undecennary, and cf. Decennial.]

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

 

© Webster 1913.

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