variant of com- before a vowel, h, and gn: coadjutor; cohabit; cognate . The prefix co-, now productively forms new words from bases beginning with any sound (co-conspirator; co-manage; coseismic ), sometimes with the derived sense “auxiliary, subsidiary” (coenzyme; copilot ), and, in mathematics and astronomy, with the sense “complement” (codeclination ). Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  together; joint or jointly; mutual or mutually: coproduction
2.  indicating partnership or equality: cofounder; copilot
3.  to the same or a similar degree: coextend
4.  (in mathematics and astronomy) of the complement of an angle: cosecant; codeclination
[from Latin, reduced form of com-]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

see com-.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

co- pref.

  1. Together; joint; jointly; mutually: coaptation.

  2. Subordinate or auxiliary: coenzyme.

  3. To the same extent or degree: codominant.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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