Dictionary

decennial

adjective de·cen·ni·al \di-ˈse-nē-əl\

Definition of DECENNIAL

1
:  consisting of or lasting for 10 years
2
:  occurring or being done every 10 years <the decennial census>
decennial noun
de·cen·ni·al·ly \-nē-ə-lē\ adverb

First Known Use of DECENNIAL

circa 1656

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