Hypertext Webster Gateway: "quadrennial"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
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