co-

co- [kəu US kou] prefix

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

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)