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CO-

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co-

 
Use CO- in a Sentence
var. 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).
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com-

 
a prefix meaning “with,” “together,” “in association,” and (with intensive force) “completely,” occurring in loanwords from Latin (commit): used in the formation of compound words before b, p, m: combine; compare; commingle.
Also, co-, col-, con-, cor-.

Origin:
< L, var. of prep. cum with
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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co-  
pref.  

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

    1. Partner or associate in an activity: coauthor; cofounder.

    2. Subordinate or assistant: copilot.

  3. To the same extent or degree: coextensive.

  4. Complement of an angle: cotangent.


[Middle English, from Latin, variant of com-, com-.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

co- 
see com-.

com- 
from L., archaic form of classical L. cum "together, together with, in combination," the prefix sometimes used as an intensive, from PIE *kom- "beside, near, by, with" (cf. O.E. ge-, Ger. ge-).
Online Etymology Dictionary, © 2001 Douglas Harper
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Legal Dictionary

Main Entry: co-
Function: prefix
1 : with : together : joint : jointly <codefendant>
2 a : associated in an action with another : fellow <co-conspirator> b : having a usually lesser share in duty or responsibility : alternate : deputy <co-counsel>
Merriam-Webster's Dictionary of Law, © 1996 Merriam-Webster, Inc.
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Medical Dictionary

co- pref.

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

  2. Subordinate or auxiliary: coenzyme.

  3. To the same extent or degree: codominant.

com- or col- or con-
pref.
Together; with; joint; jointly: commensalism.

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