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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

Police said the bus was hijacked in the Beltany Road area of Omagh, Co Tyrone, shortly before 13:00 BST on Saturday.

From BBC ● Sep. 12, 2026

His startup has raised $10 million from investors including Los Angeles-based Slauson & Co.,

From Los Angeles Times ● Aug. 28, 2026

“Our priority is ensuring Kalshi’s settlements rest on objective, scientifically validated atmospheric data,” said James Belanger, vice president of meteorology at the Weather Co.

From The Wall Street Journal ● Aug. 27, 2026

That sent long-term rates plunging but they rebounded on Thursday, with Mark Malek, of Muriel Siebert & Co, calling it "a housekeeping move destined to be short-term, at best".

From Barron's ● Aug. 21, 2026

“To” moves next, and so on until it reads: Co to the waters if it suits thee there.

From "All The Bright Places" by Jennifer Niven

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

I turned around in my chair and yelled at the CO, this big-ass dude everybody calls Sasquatch.

From "We'll Fly Away" by Bryan Bliss

Walt Disney Co. has named Karandeep Anand as the company’s first-ever chief technology officer, a move that aligns with Chief Executive Josh D’Amaro’s push toward tech integration at the Burbank media giant.

From Los Angeles Times ● Sep. 18, 2026

Ashford left the group and the music business behind in 1969, and worked at the Michigan Bell Telephone Co., though she would occasionally reunite with former Vandellas members for reunion performances.

From Los Angeles Times ● Sep. 18, 2026

Francisco Partners and KKR & Co. are said to be acquiring minority stakes in Italian business software supplier TeamSystem from Hellman & Friedman, which acquired the company in 2016.

From The Wall Street Journal ● Sep. 14, 2026

Taiwan Semiconductor Manufacturing Co., the world’s largest contract chip maker, declined 1.2%.

From The Wall Street Journal ● Sep. 14, 2026

Messrs. Pinkerton & Co. deserve great credit...and have won additional laurels by the success which has crowned their efforts.

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

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 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

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

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

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

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

From Time Magazine Archive

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

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

He told me that the C.O. who supervises him — from whom he might well have gotten sick — asked how he’d made out.

From New York Times ● Apr. 6, 2021

“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

This was supposed to be the Netherlands' time, as Johan Cruyff and co dazzled throughout the tournament with their revolutionary Total Football approach.

From BBC ● Jul. 17, 2026

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

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

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

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