| 单词 | triennial |
| 释义 | triennial —triennially, adv. /truy en"ee euhl/, adj. 1. occurring every three years. 2. lasting three years. n. 3. a third anniversary. 4. something that appears or occurs every three years. 5. a period of three years; triennium. [1555-65; TRIENNI(UM) + -AL1] |
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