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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

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

Owned by elusive tycoon Ga-Hyun Chung, Sinokor bought dozens of tankers late last year with funding from the billionaire co-founder of container giant Mediterranean Shipping Co.

From The Wall Street Journal ● Jul. 14, 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

One of the letters was directed to Samuel F. Billington, No. 7, The Crescent, Whitby, another to Herr Leutner, Varna; the third was to Coutts & Co.,

From "Dracula" by Bram Stoker

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

Patrick McGuire, senior partner at Thompsons Solicitors, said his firm had 29 cases related to the CO leak.

From BBC ● Nov. 20, 2025

The new material, however, bypasses these intermediates entirely, converting CO2 directly into CO on its surface.

From Science Daily ● Nov. 5, 2025

But moving into the fall, with the end in sight, I wanted to squeeze as much of the four or five years it took to make a good CO into my single rookie year.

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

Since then, Supply Co. has released tees, caps and random items such as rice cookers and folding chairs to commemorate company off sites and research and product milestones.

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

Shares of Taiwan Semiconductor Manufacturing Co. closed 7.3% lower, while chip-making equipment manufacturer Tokyo Electron shed 8.2%.

From The Wall Street Journal ● Jul. 17, 2026

The Potter Palmer & Co. emporium did inspire a sense of reverence in me whenever I stepped inside.

From "The Detective's Assistant" by Kate Hannigan

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

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

Write to them c/o King Features Syndicate, 300 W. 57th St., 15th floor, New York, NY 10019, or via their website: .

From Seattle Times ● Apr. 25, 2012

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

Nadiem has gained a large following as the co- founder of one of Indonesia's most successful tech companies.

From BBC ● Jun. 30, 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

NOTE.—The forms co-, col-, com-, and cor-, are euphonic variations of con-.

From New Word-Analysis by William Swinton

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

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

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

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

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

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

“Bud” Adams Jr.; television executive and producer Roone Arledge; longtime Oilers/Titans scout C.O.

From Seattle Times ● Jul. 7, 2022

As for the carbon monoxide, he said, “It was high. Had this not happened, I would have told my client, ‘You need to get your C.O. fixed.’”

From New York Times ● Mar. 24, 2017

Only the day before, his C.O. had given Milton a new assignment in the upcoming invasion.

From "Middlesex: A Novel" by Jeffrey Eugenides

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

From BBC ● Jul. 14, 2026

Ancelotti ticks that box: a record five Champions League titles and trophies in all five of Europe's major leagues carry real weight, even in a dressing room featuring Neymar, Vinicius Jr, Raphinha and co.

From BBC ● Jun. 1, 2026

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

From Science Daily ● Apr. 26, 2026

Winning cures most ills, and there is a calculated gamble from Gould, Key and co that England have a good chance of success over the coming months.

From BBC ● Mar. 20, 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