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• Co
  Co

  cobalt.
• CO
  CO

  abbreviation

  Colorado (approved especially for use with zip code).
• Co.
  Co.

  abbreviation

  Company.
• c/o
  c/o

  care of.
• C/o
  C/o

  care of.
• C/O
  C/O

  cash order.
• co-
  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 ).
• c.o.
  c.o.

  abbreviation

  care of.
• C.O.
  C.O.

  abbreviation

  cash order.
• co
  co

  abbreviation

  a commercial company (used with a country domain name)

Co

¹ American  

Symbol, Chemistry.

1. cobalt.

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CO ² American  

abbreviation

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

2. commanding officer.

3. conscientious objector.

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Co. ³ American  

Or co.

abbreviation

1. Company.

2. County.

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c/o ⁴ American  

1. care of.

2. Bookkeeping. carried over.

3. cash order.

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C/o ⁵ American  

1. care of.

2. Bookkeeping. carried over.

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C/O ⁶ American  

1. cash order.

2. certificate of origin.

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co- ⁷ American  

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 ).

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c.o. ⁸ American  

abbreviation

1. care of.

2. carried over.

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C.O. ⁹ American  

abbreviation

1. cash order.

2. Commanding Officer.

3. conscientious objector.

4. correction officer.

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CO ¹ British  

abbreviation

1. Commanding Officer

2. Commonwealth Office

3. conscientious objector

4. Colorado

5. Colombia (international car registration)

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co- ² British  

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

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Co ³ British  

abbreviation

1. (esp in names of business organizations) Company

2. informal and the rest of them

   Harold and co

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c/o ⁴ British  

abbreviation

1. care of

2. accounting carried over

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co ⁵ British  

abbreviation

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

2. Colombia

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Co ⁶ British  

symbol

1. cobalt

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Co ⁷ British  

abbreviation

1. County

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Etymology

Origin of co-

from Latin, reduced form of _com-

Example Sentences

See Examples For:

Co CO Co. c/o C/o C/O co- c.o. C.O. co

“It’s time to take a stand and say enough is enough,” said USA Today Co.

From The Wall Street Journal ● Jul. 22, 2026

The supply shortages have sent global gasoline and diesel profit margins surging, said Matthew Blair, an analyst with TPH & Co.

From MarketWatch ● Jul. 15, 2026

Two days after the Summer of Ludd ended, private jets and helicopters descended on Jackson Hole, Wyoming, to herald the start of the Allen & Co.

From Salon ● Jul. 13, 2026

Before the tournament, I kept hearing about how dangerous they would be, but Messi and Co are the only side left flying the flag.

From BBC ● Jul. 8, 2026

The octave below contra can be labelled CCC or Co; higher octaves can be labelled with higher numbers or more lines.

From "Understanding Basic Music Theory" by Catherine Schmidt-Jones and Russel Jones

Pennington's hometown was Glendale, Kentucky, and he was assigned to the 1st Space Battalion, 1st Space Brigade out of Fort Carson, CO.

From Barron's ● Mar. 10, 2026

“What Eric voted for was a resolution to condemn a horrific antisemitic attack in Boulder, CO that killed Karen Diamond, an 82-year old grandmother,” a campaign spokesman said in a statement.

From Los Angeles Times ● Jan. 28, 2026

These tests got under way the next morning but were initially checking for a gas leak, not CO.

From BBC ● Nov. 20, 2025

The city will continue to demand that the GEO Group provides full transparency of operations, that they submit a CO application to ensure compliance all around, and complete ongoing inspections for safety of all involved.

From Salon ● May 13, 2025

A second CO didn’t come clean soon enough, though.

From "Newjack: Guarding Sing Sing" by Ted Conover

Supply Co., the company’s online store, is already selling out of some items.

From The Wall Street Journal ● Jul. 22, 2026

The approved buyer of the mothballed residential, hotel and retail project is a partnership led by Kali P. Chaudhuri, whose KPC Development Co. owns and builds commercial properties in California and India.

From Los Angeles Times ● Jul. 21, 2026

“Together we will build creative experiences for our consumers across our destinations, platforms, and fan touchpoints,” Becca Vodnoy, Walt Disney Co. senior vice president of corporate alliances, said in the statement.

From Los Angeles Times ● Jul. 21, 2026

Razavi, who had previously worked as an analyst at McKinsey & Co., wrote an investment memo that examined each layer of AI, from chips to models and applications.

From The Wall Street Journal ● Jul. 18, 2026

“Harari, Sender & Co.: Monster Hunters has a nice ring to it, I think.”

From "Night Owls" by A.R. Vishny

By filling out a form online or downloading the claim form and then mailing it to Facebook Consumer Privacy User Profile Litigation, c/o Settlement Administrator, 1650 Arch Street, Suite 2210, Philadelphia, PA 19103.

From Los Angeles Times ● Apr. 18, 2023

Donations may be made online at www.miap.us or mailed to Missing in America Project, c/o John Hundahl, 1507 S. Quillan St., Kennewick, WA 99338.

From Seattle Times ● Apr. 10, 2018

From lesser-known labels such as Vetements, Off-White c/o Virgil Abloh and Yang Li to global companies such as Dries Van Noten, Rick Owens, Prada and Maison Margiela, luxury now comes with unfinished hems.

From Washington Post ● Apr. 7, 2015

Open letter to Jerry Reinsdorf c/o Mark Gonzales You are loyal to a fault.

From Chicago Tribune ● Aug. 5, 2011

You may return expense advance to Lovelace Foundation c/o me.

From "Women in Space" by Karen Bush Gibson

As I have only four weeks in which to complete my work here and get to London a 'collect reply by cable to C/o Colonel Sellheim, Australian Intermediate Base, Cairo, would greatly oblige.

From Gallipoli Diary, Volume 2 by Hamilton, Ian, Sir

The box was a gift from Felix Hoffmann, chief curator at C/O Berlin gallery, which he made in 2013.

From The Wall Street Journal ● Nov. 3, 2015

His personal project, Anniversaries, will be exhibited at C/O Berlin from June 20 to August 16.

From Time ● Jun. 5, 2015

Freeze frame … the C/O Gallery focuses on photography.

From The Guardian ● Aug. 17, 2011

C/O was thus founded to rectify Berlin’s undervaluing of art photography.

From New York Times ● Dec. 26, 2010

A decade later, the scene has since caught up — though C/O remains at the epicenter, having shown the likes of Robert Frank and Nan Goldin.

From New York Times ● Dec. 26, 2010

“Happy Father’s Day to my baby daddy and rad co- parent,” she captioned a pair of family photos.

From Los Angeles Times ● Nov. 4, 2025

The Bad Boy Records co- founder waved to his supporters as he appeared in court again on Thursday.

From BBC ● Sep. 25, 2025

He added, "We are committed to advancing our efforts to transform the prospect of a universal treatment, capable of controlling co- and serial infections of respiratory viruses and bacteria, into a reality."

From Science Daily ● Mar. 18, 2024

“The Yamnaya are extraordinary,” says the study’s co- author Volker Heyd, an archaeologist at the University of Helsinki.

From Scientific American ● Mar. 3, 2023

And I don’t want to give up the fun I have with my co- workers, especially Don Lucho with his gold tooth.

From "The Queen of Water" by Laura Resau

It seemed significant that our hero came clean about killing his c.o., the darkest element of Don Draper’s origin story, after initially lying about his rank.

From Slate ● May 11, 2015

He had said that his "humanitarian beliefs" forbade him to bear arms, but lost an appeal to the President for classification as a c.o.

From Time Magazine Archive

Investigators pronounced him sincere in his beliefs, but the draft authorities followed the Justice Department's advice and ruled that, by the letter of the law, he could not be considered a c.o.

From Time Magazine Archive

He emphasized that his c.o. ideas remained unchanged.

From Time Magazine Archive

But last week Florida educational authorities were comparably steamed up about a c.o. teacher.

From Time Magazine Archive

Alec Ginsberg, a fourth-generation pharmacist who owns C.O.

From MarketWatch ● Jul. 23, 2026

Instead, it was “so many people screaming, screaming to talk to each other. Screaming for assistance: ‘Yo, C.O., my toilet flooded.

From Slate ● May 19, 2025

The C.O. sat glued to this chair, looking bored.

From Salon ● Aug. 8, 2020

An older, more-seasoned lifeboat pilot, future station C.O.

From Seattle Times ● Aug. 18, 2019

“I’ve been here for a while. I’m C.O. of 367 over at the air station.”

From "The Great Santini" by Pat Conroy

Associate Professor Nic Rawlence, Director of the Otago Palaeogenetics Laboratory, is a co author of the new study, which investigates the fossil and its evolutionary relationships.

From Science Daily ● Jul. 11, 2026

It's just that he was up against Lionel Messi and co…

From BBC ● Jun. 11, 2026

In 2014, I was part of the side that returned home with our tails between our legs after losing 5-0 to Mitchell Johnson and co.

From BBC ● Jun. 2, 2026

Liverpool's season to forget may have finished last week but the problems continue for Slot and co.

From BBC ● May 29, 2026

When I got to the trailer, I was able to say what I had been waiting all week to spring on her: "Chi co khoe khong?"

From "Counting by 7s" by Holly Goldberg Sloan