Jump To:

• 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.

---

CO ² American  

abbreviation

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

2. commanding officer.

3. conscientious objector.

---

Co. ³ American  

Or co.

abbreviation

1. Company.

2. County.

---

c/o ⁴ American  

1. care of.

2. Bookkeeping. carried over.

3. cash order.

---

C/o ⁵ American  

1. care of.

2. Bookkeeping. carried over.

---

C/O ⁶ American  

1. cash order.

2. certificate of origin.

---

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 ).

---

c.o. ⁸ American  

abbreviation

1. care of.

2. carried over.

---

C.O. ⁹ American  

abbreviation

1. cash order.

2. Commanding Officer.

3. conscientious objector.

4. correction officer.

---

CO ¹ British  

abbreviation

1. Commanding Officer

2. Commonwealth Office

3. conscientious objector

4. Colorado

5. Colombia (international car registration)

---

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

---

Co ³ British  

abbreviation

1. (esp in names of business organizations) Company

2. informal and the rest of them

   Harold and co

---

c/o ⁴ British  

abbreviation

1. care of

2. accounting carried over

---

co ⁵ British  

abbreviation

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

2. Colombia

---

Co ⁶ British  

symbol

1. cobalt

---

Co ⁷ British  

abbreviation

1. County

---

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

Rice was most recently chairman of Walt Disney Television and chairman of General Entertainment for Walt Disney Co.

From Los Angeles Times ● Oct. 15, 2026

He referred to the decision by Henry Ford, the founder of Ford Motor Co.

From MarketWatch ● Oct. 13, 2026

He invented the Westinghouse air brake, making train travel safe and comfortable, and founded the Westinghouse Electric Co.

From The Wall Street Journal ● Oct. 6, 2026

He also handed over a black-and-yellow Jacob & Co.

From Los Angeles Times ● Oct. 5, 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

Images of Air Force One parked at the Turkish airport show vehicles labeled with the logo of a catering company called Turkish DO & CO.

From The Wall Street Journal ● Aug. 13, 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 new material, however, bypasses these intermediates entirely, converting CO2 directly into CO on its surface.

From Science Daily ● Nov. 5, 2025

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

From "Newjack: Guarding Sing Sing" by Ted Conover

Anthropic’s third-quarter revenue grew sharply, while Taiwan Semiconductor Manufacturing Co., the world’s largest contract chip maker, posted another record profit.

From The Wall Street Journal ● Oct. 15, 2026

Wednesday’s selloff will not be the last for AI names, according to Yorkville Ives & Co. analyst Dan Ives.

From MarketWatch ● Oct. 14, 2026

That makes for some concentrated and predictable holdings in large technology-oriented names, such as Samsung Electronics, Taiwan Semiconductor Manufacturing Co. and Alphabet, which owns Google.

From MarketWatch ● Oct. 12, 2026

Ford Motor Co. last December named Scott Hauman its first head of nomenclature.

From The Wall Street Journal ● Oct. 8, 2026

“Another minute, and she will despise me for a hypocrite,” thought I; and an impulse of fury against Reed, Brocklehurst, and Co. bounded in my pulses at the conviction.

From "Jane Eyre" by Charlotte Brontë

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 Sir Ian Hamilton

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

Professor Rob Ogden has been closely involved in setting up the project and is co- founder of the organisation Trace, which promotes the use of forensic science in wildlife law enforcement.

From BBC ● Feb. 19, 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

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

Last week he got the Board to order the trial of a c.o. for incompetence.

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

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

“A C.O. had told me that I was never going home and that really got to me,” he said of one occasion.

From New York Times ● Dec. 17, 2021

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

From "The Great Santini" by Pat Conroy

Vinicius Jr. and co topped Group C - knocking out Scotland in the process - but were unconvincing on the one occasion they were truly tested, drawing 1-1 with Morocco in their opening fixture.

From BBC ● Jun. 28, 2026

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

From BBC ● May 29, 2026

Ochwat and study co author Ted Scambos, a senior research scientist at the University of Colorado Boulder, said new satellite technologies could significantly improve scientists' understanding of rapid glacier retreat.

From Science Daily ● May 19, 2026

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

From BBC ● Apr. 30, 2026

“Down co the sty to slop the hogs,” Grandma called back.

From "A Long Way from Chicago" by Richard Peck

Random Word

Spin the wheel and learn a new word!

---