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Co

Origin

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Colorado (approved especially for use with zip code).

Commanding Officer.

conscientious objector.

Dictionary.com Unabridged

Symbol, Chemistry.

cobalt.

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).

Company.

County.

Also, co.

cash order.

certificate of origin.

care of.

Bookkeeping. carried over.

care of.

Bookkeeping. carried over.

cash order.

Commanding Officer.

conscientious objector.

correction officer.

care of.

carried over.

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Link To Co

Collins

World English Dictionary

co

—*the internet domain name for*
1.	a commercial company (used with a country domain name)
2.	Colombia

Co¹

—*the chemical symbol for*
	cobalt

Co²

—*abbreviation for*
	County

Co or co³

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

co or co³ (kəʊ)

—*abbreviation for*

Co or co³

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

co or co³ (kəʊ)

—*abbreviation for*

CO

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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline

Word Origin & History

co-

see com-.

EXPAND

c/o

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

COLLAPSE

Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage

Medical Dictionary

Co
The symbol for the element cobalt.

co- pref.

Together; joint; jointly; mutually: coaptation.
Subordinate or auxiliary: coenzyme.
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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American Heritage

Science Dictionary

Co
The symbol for cobalt.

cobalt (kō'bôlt') Pronunciation Key
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.

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