Main Entry: quin·quen·ni·al

Pronunciation: \kwin-ˈkwe-nē-əl, kwiŋ-\

Function: adjective

Date: 15th century

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

— quinquennial noun

— quin·quen·ni·al·ly \-nē-ə-lē\ adverb