quadrennium

noun
qua·dren·ni·um | \kwä-ˈdre-nē-əm \
plural quadrenniums or quadrennia\kwä-ˈdre-nē-ə \

Definition of quadrennium 

: a period of four years

First Known Use of quadrennium

1754, in the meaning defined above

History and Etymology for quadrennium

Latin quadriennium, from quadri- + annus year — more at annual

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The first known use of quadrennium was in 1754

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