vicennial


vi·cen·ni·al

adjective \vī-ˈse-nē-əl\

Definition of VICENNIAL

:  occurring once every 20 years

Origin of VICENNIAL

Late Latin vicennium period of 20 years, from Latin vicies 20 times + annus year; akin to Latin viginti twenty — more at vigesimal, annual
First Known Use: circa 1859

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