Dictionary
triennial
adjective tri·en·ni·al \(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
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First Known Use of TRIENNIAL
1562
Rhymes with TRIENNIAL
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