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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

In 1917, he renamed his firm the Boeing Airplane Co.

From The Wall Street Journal ● Jul. 15, 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

“There was a ‘can-do’ attitude I learned from Walt and my father,” Iwerks said, according to a statement shared by the Disney Co.

From Los Angeles Times ● Jul. 12, 2026

He had planned on riding a bicycle, just to be funny, and even went so far as to order one from Sears, Roebuck and Co.

From "Cold Sassy Tree" by Olive Ann Burns

Because CO chondrites contain relatively little sulfur, the new evidence suggests that sulfur from the meteorite itself may not have been the main driver of the catastrophe.

From Science Daily ● Jul. 19, 2026

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

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

His dad was a CO, he told me, his uncle a policeman, his sister a scientist.

From "Newjack: Guarding Sing Sing" by Ted Conover

It also said it had sold off the trademark and other assets related to Maple Street Biscuit Co. a fast-casual chain it had owned, and said it would close that chain’s 16 remaining locations.

From MarketWatch ● Jul. 28, 2026

The artificial intelligence giant in recent months has invested $150 million in a new enterprise partner program and launched the OpenAI Deployment Co., a stand-alone services firm that will embed technical expertise with business customers.

From The Wall Street Journal ● Jul. 22, 2026

Walt Disney Co. is laying off several hundred employees, including at Pixar Animation Studios and National Geographic, a company spokesperson said Tuesday.

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

But tonight, for reasons that will never be explained, three police vehicles arrive at the Economy Printing Co. at 9125 Twelfth Street—three blocks from Pingree—and park at the curb.

From "Middlesex: A Novel" by Jeffrey Eugenides

For some time afterward, envelopes containing dollar bills made their way to “Viva Superstar, c/o The Chelsea Hotel.”

From New York Times ● Apr. 28, 2023

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

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

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

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

From New York Times ● Dec. 26, 2010

The co- leader of Aberdeen City Council, Ian Yuill, told BBC Scotland News it had been the most intense and sustained period of snow he could remember in more than 50 years.

From BBC ● Jan. 6, 2026

“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

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

The Selective Service Act makes it unmistakably clear that no one is to be exempted from the draft as a c.o. unless he holds to a "belief in a relation to a Supreme Being."

From Time Magazine Archive

A New Yorker of draft age, Seeger claimed exemption as a conscientious objector, but he was an unusual sort of c.o.

From Time Magazine Archive

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

From Time Magazine Archive

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

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

“A lot of big names come into C.O. Bigelow; they’re usually pretty humble,” Mr. O’Connor said.

From New York Times ● Mar. 5, 2020

“Did all the pilots get the word about the briefing today, Sergeant?” the C.O. asked.

From "The Great Santini" by Pat Conroy

Pau Cubarsi: A commanding presence at the heart of defence as Mbappe, Dembele, Olise and co failed to ignite.

From BBC ● Jul. 14, 2026

Football fever is growing in the States with the co hosts looking an organised side.

From BBC ● Jul. 4, 2026

It will be close, but I am going for Eli Junior Kroupi and co to edge this.

From BBC ● Apr. 30, 2026

The work was co led by Henn and Simon Gravel of McGill University.

From Science Daily ● Apr. 26, 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