Definition of co- in English:

co-

prefix

3(Forming verbs) together with another or others: co-produce
4 Mathematics Of the complement of an angle: cosine

Origin

from Latin, originally a form of com-.

Definition of co- in:

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Word of the day oleaginous
Pronunciation: ˌōlēˈajənəs
adjective
rich in, covered with, or producing oil; oily