triennial
Syllabification: (tri·en·ni·al)
Pronunciation: /trīˈenēəl/
Definition of triennial
adjective
noun
Origin:
mid 16th century: from late Latin triennis (from Latin tri- 'three' + annus 'year') + -al
mid 16th century: from late Latin triennis (from Latin tri- 'three' + annus 'year') + -al