Longman Dictionary of Contemporary English homepage

Language: Latin
Origin: 'together, with', from com-; COM-

co-

 prefix
     
co-
1 together with:
to coexist (=exist together or at the same time)
coeducation (=with boys and girls together)
2 doing 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)
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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