American Dictionary
Definition co- in American English
co- prefix
prefix
/koʊ/
1
together: used with some nouns, verbs, and adjectives
Example
coeducation (=the education of boys and girls together)
Example
cohabiting couples (=people living together without being married)
2
sharing a job or responsibility: used with some nouns, verbs, and adjectives
Example
her co-star (=another main actor taking part with her in the film)
Example
my codriver (=someone who drives so that I can rest)
