Other definitions for CO (2 of 9)


  1. Colorado (approved especially for use with zip code).

Other definitions for co- (3 of 9)


  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).

Other definitions for c/o (4 of 9)


  1. care of.

  2. Bookkeeping. carried over.

  1. cash order.

Other definitions for c.o. (5 of 9)


  1. care of.

  2. carried over.

Other definitions for Co. (6 of 9)


  1. Company.

  2. County.

Other definitions for C/o (7 of 9)


  1. care of.

  2. Bookkeeping. carried over.

Other definitions for C/O (8 of 9)


  1. cash order.

  2. certificate of origin.

Other definitions for C.O. (9 of 9)


  1. cash order.

  2. Commanding Officer.

  1. conscientious objector.

  2. correction officer.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use Co in a sentence

  • In this case, I suspect, there was Co-operant a strongly marked childish characteristic, the love of producing an effect.

    Children's Ways | James Sully
  • The conception of the relation of this institution with them as Co-operative makes headway slowly.

    Readings in Money and Banking | Chester Arthur Phillips
  • Then they were to Co-operate with an army moving up from Arkansas, and the State would be redeemed.

  • And the Process or Method of study, if it be an Assimilating one, also compels this Co-operation.

    Assimilative Memory | Marcus Dwight Larrowe (AKA Prof. A. Loisette)
  • The leaguers were now anxious to Co-operate with the Americans in compelling the Spaniards to evacuate the Archipelago.

    The Philippine Islands | John Foreman

British Dictionary definitions for co (1 of 7)


the internet domain name for
  1. a commercial company (used with a country domain name)

  2. Colombia

British Dictionary definitions for Co (2 of 7)


the chemical symbol for
  1. cobalt

British Dictionary definitions for Co (3 of 7)


abbreviation for
  1. County

British Dictionary definitions for Co (4 of 7)


abbreviation for
  1. (esp in names of business organizations) Company

  2. and co (kəʊ) informal and the rest of them: Harold and co

British Dictionary definitions for CO (5 of 7)


abbreviation for
  1. Commanding Officer

  2. Commonwealth Office

  1. conscientious objector

  2. Colorado

  3. Colombia (international car registration)

British Dictionary definitions for co- (6 of 7)


  1. together; joint or jointly; mutual or mutually: coproduction

  2. indicating partnership or equality: cofounder; copilot

  1. to the same or a similar degree: coextend

  2. (in mathematics and astronomy) of the complement of an angle: cosecant; codeclination

Origin of co-

from Latin, reduced form of com-

British Dictionary definitions for c/o (7 of 7)


abbreviation for
  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

Scientific definitions for Co


The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.