English

Definition of triennial adjective from the Oxford Advanced Learner's Dictionary

 

triennial

 adjective
adjective
BrE BrE//traɪˈeniəl//
 
; NAmE NAmE//traɪˈeniəl//
 
 
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happening every three years Word Origin mid 16th cent.: from late Latin triennis (from Latin tri- ‘three’ + annus ‘year’) + -al.
See the Oxford Advanced American Dictionary entry: triennial