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cos

1 American  
[kos, kaws] / kɒs, kɔs /

noun

  1. romaine.


cos 2 American  

abbreviation

  1. Trigonometry, Mathematics. cosine.


cos. 3 American  

abbreviation

  1. companies.

  2. consul.

  3. consulship.

  4. counties.


C.O.S. 4 American  
Or c.o.s.

abbreviation

  1. cash on shipment.


Cos 1 British  
/ kɒs /

noun

  1. a variant spelling of Kos

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

cos 2 British  
/ kɒs /

noun

  1. Usual US and Canadian name: romaine.  a variety of lettuce with a long slender head and crisp leaves Compare cabbage lettuce

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

COS 3 British  

abbreviation

  1. Chief of Staff

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

cos 4 British  
/ kɒz /

abbreviation

  1. cosine

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

cos Scientific  
  1. Abbreviation of cosine


Etymology

Origin of cos

1690–1700; after Kos, where it originated

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

"I just started stuffing cheese in my mouth cos I can't stop grinning. Isn't it funny? I was so nervous when Claudia squeezed my shoulder blade, and now I just love being a traitor."

From BBC Oct. 22, 2025

He said he was with Annie when she died, a moment referenced in the song with the line: "I stayed all night till you left this life cos that's just love."

From BBC Nov. 19, 2024

In brief, the TerS subunit initiates packaging when it encounters a specific site called cos in the genome.

From Science Daily Nov. 21, 2023

Figure 27.42 A polarizing filter transmits only the component of the wave parallel to its axis, E cos θ , reducing the intensity of any light not polarized parallel to its axis.

From Textbooks Aug. 12, 2015

“Dad was dead chuffed . . . thought I migh’ not be a wizard, see, cos me mum . . . well, anyway.

From "Harry Potter And The Goblet Of Fire" by J. K. Rowling

Bro cos. become corporate frat houses, where employees are chosen like pledges, based on “culture fit.”

From New York Times Apr. 1, 2017

Eur. denotes that the Australian bird is closely similar in form, habits, &c., to the corresponding European bird. =vt. cos. denotes that it is the equivalent or representative of a cosmopolitan group of birds.

From An Australian Bird Book A Pocket Book for Field Use by John Albert Leach

Varnum's Regt. is to take fort Box & the Oblong redoubt for their alarm posts, fort Box 6 cos., oblong redoubt 2 cos.

From The Campaign of 1776 around New York and Brooklyn by Henry P. Johnston

A., T., N.Z. =vt. cos. bird. c. lagoons, bays        60 White; wings, tail black; bill pink, pouch yellowish; f., sim.

From An Australian Bird Book A Pocket Book for Field Use by John Albert Leach

Caps. are directed to examine the arms of their cos. immediately.

From The Campaign of 1776 around New York and Brooklyn by Henry P. Johnston

Of course, to give pennies in the street is much less trouble than to run the C.O.S.

From The Human Machine by Arnold Bennett

As a method of producing a quick, inexpensive, and pleasing effect on one's egotism the C.O.S. is simply not in it with this dodge of giving pennies at random, without inquiry.

From The Human Machine by Arnold Bennett

Also the C.O.S. would not have admired him.

From This Is the End by Stella Benson

Oddly enough she was actually employed in the C.O.S.

From Fifty-One Years of Victorian Life by Margaret Elizabeth Leigh Child-Villiers

Take a class in a college settlement, make some bibs for a day nursery, give tramps a C.O.S. card, with one's compliments, and attend about six lectures a year on Philanthropy—the lectures very good indeed.

From The Warriors by Anna Robertson Brown Lindsay

“Stablecoins attempt to import credibility from public money while operating outside the established settlement system,” Pablo Hernández de Cos, general manager of the Bank for International Settlements, noted in a recent speech.

From The Wall Street Journal May 25, 2026

Among future contenders for the ECB presidency is ex-Bank of Spain governor Pablo Hernández de Cos and ex-Netherlands central bank chief Klaas Knot, current Bundesbank head Joachim Nagel and ECB board member Isabel Schnabel.

From MarketWatch Feb. 18, 2026

Three people who bought homes and took out mortgage loans through subsidiaries of Rocket Cos.

From MarketWatch Jan. 30, 2026

The Swedish fashion giant, which also operates Arket, Cos, Monki, & Other Stories and Weekday, says it has more than 4,000 stores worldwide across 75 markets.

From BBC Mar. 27, 2025

Cos x = 1 when x = 0, so the whole expression equals 1/1 = 1.

From "Zero: The Biography of a Dangerous Idea" by Charles Seife

Reselling items, including at Sellpy and at its other brands such as COS, made up about 0.8% of H&M’s overall sales revenue in 2025, the company said.

From The Wall Street Journal Aug. 3, 2026

The COS was made of grecanico, as garganega, the grape of Soave, is known in Sicily.

From New York Times Jan. 20, 2022

But she had some success with fashion retailer COS.

From BBC Oct. 4, 2021

The post continues to explain that the COS recognizes that the "public is concerned about these incidents" and that the organization is also concerned about coyote behavior in the area.

From Fox News Aug. 12, 2021

COS, or COOS, one of the islands called the Cyclades, in the Ægean sea, famous for being the birth-place of Apelles; now Stan Co.

From A Dialogue Concerning Oratory, Or The Causes Of Corrupt Eloquence The Works Of Cornelius Tacitus, Volume 8 (of 8); With An Essay On His Life And Genius, Notes, Supplements by Cornelius Tacitus

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