co-

co- [ kou ] prefix

1. ) together: used with some nouns, verbs, and adjectives:

coeducation (=educating boys and girls together)

cohabiting couples (=people living together without being married)

2. ) sharing a job or responsibility: used with some nouns, verbs, and adjectives:

her co-star (=another main actor taking part with her in the film)

my codriver (=someone who drives so that I can rest)