Main Entry: qua·dren·ni·al

Pronunciation: \kwä-ˈdre-nē-əl\

Function: adjective

Date: circa 1656

1 : consisting of or lasting for four years
2 : occurring or being done every four years

— quadrennial noun

— qua·dren·ni·al·ly \-nē-ə-lē\ adverb