Quadrennial a. : Comprising four years; as, a quadrennial period.

Quadrennial a. : Occurring once in four years, or at the end of every four years; as, quadrennial games.

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Taxonomy
Merriam-Webster Online Dictionary, Dictionary, webster, dren, four years, Word Games, Webster Online Dictionary with audio pronunciations, glossary, english, language, ESL, kwä, adjective, lasting, ly, adverb, Unabridged Dictionary, Search Boxes.

Defination from the web:
quadrennial from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Learn more about "quadrennial" and related topics at Britannica.com. See a map of "quadrennial" in the Visual Thesaurus. Pronunciation ...