quadrennium

noun
qua·​dren·​ni·​um | \ kwä-ˈdre-nē-əm How to pronounce quadrennium (audio) \
plural quadrenniums or quadrennia\ kwä-​ˈdre-​nē-​ə How to pronounce quadrennia (audio) \

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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