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English definition of “bi-”

bi-

prefix uk   /baɪ-/ us  

bi- prefix (TWICE)

twice, or once every two: We meet bi-monthly (= twice every month or once every two months).Relating to regular periods of time

bi- prefix (TWO)

having two: a biped (= an animal that walks on two legs) a biplane (= an old-fashioned aircraft with two wings)Cardinal numbers, including nought and zero
(Definition of bi- prefix from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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