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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. 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 2 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 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  
/ 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 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.

"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

In this case, F cos θ is constant.

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

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.