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bi-

combining form
🔊/baɪ/
🔊/baɪ/
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  1. (in nouns and adjectives构成名词和形容词) two; twice; double二；两次；两倍；双
    • bilingual双语的
    • bicentenary两百周年
    Bi- with a period of time can mean either ‘happening twice’ in that period of time, or ‘happening once in every two’ periods.
    Word Originfrom Latin, ‘doubly, having two’; related to Greek di- ‘two’.