QUADRENNIAL

quadrennial. Quadrennial, a. happening once every four years

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Quad‐ren″ni‐al (?), a. [[L. quadriennium a space of four years; quattuor four + annus year; cf. L. quadriennis. See Quadrate, and Annual.]] 1. 1. Comprising four years; as, a quadrennial period.
2. 2. Occurring once in four years, or at the end of every four years; as, quadrennial games.