The Collaborative International Dictionary of English. 2000.
undecennial — a. happening every, or lasting, eleven years … Dictionary of difficult words
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.… … The Collaborative International Dictionary of English
un|de|cen|na|ry — «UHN dih SEHN uhr ee», adjective. = undecennial. (Cf. ↑undecennial) … Useful english dictionary
Anniversary — For other uses, see Anniversary (disambiguation). An anniversary is a day that commemorates and/or celebrates a past event that occurred on the same day of the year as the initial event. For example, the first event is the initial occurrence or,… … Wikipedia
undec- — combining form Etymology: Latin undecim, probably from unus one + decem ten more at one, ten : eleven undecane undecennial undecillion … Useful english dictionary
