bienniumn.
英 baɪ'enɪəm | 美 baɪ'ɛnɪəm
中文n. 两年时期（期间）
词根词源
biennium (n.)"space of two years," by 1851, from Latin biennium "two years, a period of two years," from bi- + annus "year" (see annual). For vowel change, see biennial.
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