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Definition of bi- combining form from the Oxford Advanced Learner's Dictionary

bi-

combining form

/baɪ/

/baɪ/

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(in nouns and adjectives) two; twice; double
- bilingual
- bicentenary
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’.

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