Co


Symbol, Chemistry.


CO

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

co-

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.

or co.

c.o.

care of.
carried over.

c/o

care of.
Bookkeeping. carried over.
cash order.

C/o

care of.
Bookkeeping. carried over.

C.O.

cash order.
Commanding Officer.
conscientious objector.
correction officer.

C/O

cash order.
certificate of origin.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for co

Contemporary Examples of co

Historical Examples of co



British Dictionary definitions for co

co

the internet domain name for

a commercial company (used with a country domain name)
Colombia

Co

1

the chemical symbol for

cobalt

Co

2

abbreviation for

County

Co

3

co

abbreviation for

(esp in names of business organizations) Company
and co (kəʊ) informal and the rest of themHarold and co

CO

abbreviation for

Commanding Officer
Commonwealth Office
conscientious objector
Colorado
Colombia (international car registration)

co-

prefix

together; joint or jointly; mutual or mutuallycoproduction
indicating partnership or equalitycofounder; copilot
to the same or a similar degreecoextend
(in mathematics and astronomy) of the complement of an anglecosecant; codeclination

Word Origin for co-

from Latin, reduced form of com-

c/o

abbreviation for

care of
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

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

Medicine definitions for co

Co

The symbol for the elementcobalt

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.

Science definitions for co

Co

The symbol for cobalt.

cobalt

[kōbôlt′]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.