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Definition of co- prefix from the Oxford Advanced Learner's Dictionary

co-

prefix
 
/kəʊ/
 
/kəʊ/
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  1. (used in adjectives, adverbs, nouns and verbs) together with
    • co-produced
    • cooperatively
    • co-author
    • coexist
    Word Originfrom Latin.
See co- in the Oxford Advanced American Dictionary
halfway
adverb
 
 
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