quinquennium

noun
quin·​quen·​ni·​um | \ kwin-ˈkwe-nē-əm How to pronounce quinquennium (audio) , kwiŋ-\
plural quinquenniums or quinquennia\ kwin-​ˈkwe-​nē-​ə How to pronounce quinquennia (audio) , kwiŋ-​ \

Definition of quinquennium

: a period of five years

First Known Use of quinquennium

1621, in the meaning defined above

History and Etymology for quinquennium

Latin, from quinque five + annus year — more at five, annual

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