co-

co- in Latin, the form of com- in compounds with stems beginning in vowels and h- and gn- (see COM- (Cf. com-)). Taken in English from 17c. as a living prefix meaning “together, mutually, in common,” and used promiscuously with native words and Latin-derived words not beginning with vowels, sometimes even with words already having it (e.g. co-conspiritor).

Etymology dictionary. 2014.

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