1
- recurring every three years三年一现的：
the triennial meeting of the Association.
三年一次的联盟会议。
1.1
- lasting for or relating to a period of three years持续三年的; 与三年有关的。
- a visitation of an Anglican diocese by its bishop every three years（英国国教主教对其教区）每三年一次的巡视。
派生词
triennially
adverb词源
mid 16th cent.: from late Latin triennis （from Latin tri- 'three' + annus 'year'） + -AL.