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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