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

 

co-

 prefix
prefix
BrE BrE//kəʊ//
 
; NAmE NAmE//koʊ//
 
 
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(used in adjectives, adverbs, nouns and verbs) together with co-produced cooperatively co-author coexist More Like This Prefixes a-, ante-, anti-, be-, co-, de-, demi-, dis-, en-, ex-, extra-, hyper-, hypo-, il-, in-, infra-, inter-, intra-, mis-, non-, off-, oft-, out-, over-, para-, post-, pre-, pro-, re-, retro-, semi-, sub-, trans-, ultra-, un-, under-, up-See worksheet. Word Originfrom Latin.
See the Oxford Advanced American Dictionary entry: co-