Quadrennial definitions

kwŏ-drĕn'ē-əl
Happening once in four years.
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Lasting for four years.
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Happening every four years.
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Lasting four years.
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A quadrennial event or occurrence.
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1852, Millard Fillmore, State of the Union Address.

The quadrennial election of Chief Magistrate has passed off with less than the usual excitement.

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Lasting for four years.
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Origin of quadrennial

From Latin quadriennial (“four-year period"), from quattuor (“four") + annus (“year").