繼續四年的;每四年
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. 2. Occurring once in four years, or at the end of every four years; as, quadrennial games.