1630s, "lasting three years;" 1640s, "occurring every three years," with -al (1) + Latin triennium "three-year period," from tri- "three" (see tri-) + annus "year" (see annual). For vowel change, see biennial. As a noun, 1630s. Related: Triennially.
双语例句
1. The triennial Council on Legislation affects all club and district activities.
立法案可能是由扶轮社及地区提交下一届的立法会议.
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2. We signed a triennial contract yesterday.
昨日签了一项三年的合约.
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3. Ming Wanli three decades ( 1607 ), held in Beijing, the national triennial imperial examinations.