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CO

1.
Colorado (approved especially for use with zip code).
2.
Commanding Officer.
3.
conscientious objector.

Co

Symbol, Chemistry
1.

co-

1.
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).

Co.

1.
2.
Also, co.

C/O

1.
cash order.
2.
certificate of origin.

C/o

1.
care of.
2.
Bookkeeping. carried over.

c/o

1.
care of.
2.
Bookkeeping. carried over.
3.
cash order.

C.O.

1.
cash order.
2.
Commanding Officer.
3.
conscientious objector.
4.
correction officer.

c.o.

1.
care of.
2.
carried over.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for CO
  • As the eldest of her family, she inherited the family castle in trim, CO.
British Dictionary definitions for CO

co

abbreviation
1.
a commercial company (used with a country domain name)
2.
Colombia

Co1

Chemical symbol
1.
cobalt

Co2

abbreviation
1.
County

Co3

abbreviation
1.
(esp in names of business organizations) Company
2.
(informal) and co (kəʊ). and the rest of them: Harold and co

CO

abbreviation
1.
Commanding Officer
2.
Commonwealth Office
3.
conscientious objector
4.
Colorado
5.
Colombia (international car registration)

co-

prefix
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
Word Origin
from Latin, reduced form of com-

c/o

abbreviation
1.
care of
2.
(accounting) carried over
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for CO

co-

in Latin, the form of com- in compounds with stems beginning in vowels and h- and gn- (see 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).

c/o

addressing abbreviation for care of; "common" by 1889.

co.

abbreviation of company, attested by 1670s.

Online Etymology Dictionary, © 2010 Douglas Harper
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CO in Medicine

Co
The symbol for the element cobalt.

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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CO in Science
Co  
The symbol for cobalt.
cobalt
  (kō'bôlt')   
Symbol Co
A silvery-white, hard, brittle metallic element that occurs widely in metal ores. It is used to make magnetic alloys, heat-resistant alloys, and blue pigment for ceramics and glass. Atomic number 27; atomic weight 58.9332; melting point 1,495°C; boiling point 2,900°C; specific gravity 8.9; valence 2, 3. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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CO in Technology

networking
The country code for Colombia.
(1999-01-27)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Related Abbreviations for CO

co

Corsican

Co

  1. cobalt
  2. Corinthians

CO

  1. carbon monoxide
  2. cardiac output
  3. cash order
  4. Colorado
  5. Colombia (international vehicle ID)
  6. commanding officer
  7. conscientious objector
  8. cutoff
  9. cut out

co.

  1. company
  2. county

Co.

  1. company
  2. county

c.o.

carried over

C.O.

common orders

c/o

  1. care of
  2. carry over
  3. complains of

C/O

  1. cash order
  2. certificate of origin
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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