co-
- together: coact
- mutually, equally: coextensive
- joint or jointly: copilot, coauthor
- Math. complement of: cosine
See co- in American Heritage Dictionary 4
prefix- Together; joint; jointly; mutually: coeducation.
a. Partner or associate in an activity: coauthor; cofounder.
b. Subordinate or assistant: copilot.
- To the same extent or degree: coextensive.
- Complement of an angle: cotangent.
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