decenniad
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decenniad — n. ten year period, ten year anniversary … English contemporary dictionary
decenniad — de·cen·ni·ad … English syllables
de|cen|ni|um — «dih SEHN ee uhm», noun, plural ni|ums, ni|a « nee uh». a period of ten years; decade; decenniad. ╂[< Latin decennium < decennis of ten years < decem ten + annus year] … Useful english dictionary