Quadrennium n. : A space or period of four years.

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Taxonomy
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Defination from the web:
quadrennium from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Learn more about "quadrennium" and related topics at Britannica.com. Pronunciation Symbols. Share this entry: Link to this page: Cite this ...