Definition of bi- combining form from the Oxford Advanced American Dictionary

 

bi-

 combining form
combining form
NAmE//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.
See the Oxford Advanced Learner's Dictionary entry: bi-