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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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  1. (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’.
See bi- in the Oxford Advanced American Dictionary
Check pronunciation: bi-

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trait
noun
 
 
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