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From The Collaborative International Dictionary of English v.0.48:
Quadrennial \Quad*ren"ni*al\, a. [L. quadriennium a space of four years; quattuor four + annus year; cf. L. quadriennis. See Quadrate, and Annual.] 1. Comprising four years; as, a quadrennial period. [1913 Webster] 2. Occurring once in four years, or at the end of every four years; as, quadrennial games. [1913 Webster]