triennial


tri·en·ni·al

adjective \(ˌ)trī-ˈe-nē-əl\

Definition of TRIENNIAL

1
:  occurring or being done every three years <the triennial convention>
2
:  consisting of or lasting for three years <a triennial contract>
triennial noun
tri·en·ni·al·ly \-nē-ə-lē\ adverb

First Known Use of TRIENNIAL

1562

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