TRIENNIAL


Meaning of TRIENNIAL in English

tri ‧ en ‧ ni ‧ al /traɪˈeniəl/ BrE AmE adjective

[ Date: 1500-1600 ; Language: Latin ; Origin: triennis , from triennium 'three years' , from tri- + annus 'year' ]

happening every three years ⇨ annual

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.