英语词汇triennial的起源、历史背景-英语词源词典

词汇	triennial
词源	triennial adj. 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 (adj.)). For vowel change, see biennial. As a noun, 1630s. Related: Triennially. Entries linking to triennial -al 1 suffix forming adjectives from nouns or other adjectives, "of, like, related to, pertaining to," Middle English -al, -el, from French or directly from Latin -alis (see -al (2)). tri- word-forming element meaning "three, having three, once every three," from Latin tres (neuter tria) or Greek treis, trias "three" (see three). -al (1)tri-annual (adj.)biennial (adj.) updated on January 15, 2017
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英语词源词典收录了45867条英语词源词条，基本涵盖了全部常用英语词汇的起源、历史，是研究英语词汇或通过词源学英语的必备工具。

triennial adj.