quinquennium

noun
quin·​quen·​ni·​um | \kwin-ˈkwe-nē-əm, kwiŋ-\
plural quinquenniums or quinquennia\ kwin-​ˈkwe-​nē-​ə , 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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The first known use of quinquennium was in 1621

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