noun pl. quadrenniums or quadrennia
Origin: L quadriennium < quadri- (see quadri-) + annus, year (see annual)
See quadrennium in American Heritage Dictionary 4
noun pl. quad·ren·ni·ums or quad·ren·ni·a (kwô-drĕnˈē-ə)
Origin:
Origin: Latin quadriennium
Origin: : quadri-, quadri-
Origin: + annus, year; see at- in Indo-European roots
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