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Definition of quadrennially : Once in four years.

Usage examples:

• Then arose the controversy, quadrennially renewed and with increasing provocation, in 1820, in 1824, and in 1828- each stage intensifying the discontent, arising more from the injustice than the weight of the burden borne. - "The Rise and Fall of the Confederate Government, Vol. 1 (of 2)", Jefferson Davis.