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

 

bi-

 combining form
combining form
BrE BrE//baɪ//
 
; NAmE 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. Word Originfrom Latin, ‘doubly, having two’; related to Greek di- ‘two’.
See the Oxford Advanced American Dictionary entry: bi-