From Longman Dictionary of Contemporary Englishco-co- /kəʊ $ koʊ/ prefix 1 TOGETHERtogether with to coexist (=exist together or at the same time) coeducation (=with boys and girls together)2 WITHdoing something with someone else as an equal or with less responsibility my co-author (=someone who wrote the book with me) the co-pilot (=someone who helps a pilot)
Examples from the Corpus
co-• a coeducational school• the copilotCo.Co. /kəʊ $ koʊ/ 1 BBCthe abbreviation of company James Smith & Co.2 → and co3 PGAREAthe written abbreviation of county Co. DurhamCOCO the written abbreviation of ColoradoC.O.C.O. /ˌsiː ˈəʊ◂ $ -ˈoʊ◂/ noun [countable] PMIN CHARGE OF (Commanding Officer) an officer who is in charge of a military unitFrom Longman Business DictionaryCoCo COMMERCEwritten abbreviation for Companycoco /kəʊkoʊ/ prefix added to the front of a noun to show that someone does a job with someone elsethe co-chairman of Saatchi & SaatchiHer brother is co-director of a medical research firm.The claims will be paid by American International and six other co-insurers.Origin co- Latin “together, with”, from com-; → COM- 