Definitions
from The American Heritage® Dictionary of the English Language, 4th Edition
 n. See romaine.
 abbr. cosine
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. a symbol of the trigonometric function cosine.
 n. A variety of lettuce with long, crisp leaves.
 conj. because
from The Century Dictionary and Cyclopedia
 n. See coss.
 n. An abbreviation of cosine.
 n. A kind of lettuce, suited for being grown out of doors in summer, usually forming long heads or rosettes.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 n. ratio of the adjacent side to the hypotenuse of a rightangled triangle
 n. lettuce with long darkgreen leaves in a loosely packed elongated head
Etymologies
Examples

You know for example, that: sin (4x) = 2sin (2x) cos (2x) sin (2x) = 2sin (x) cos (x) cos (2x) = cos² (x)  sin² (x), etc ...

cos A + iSinA + cos C +iSin C = 2 (cos B+ iSinB) cos A+Cos C +i (sin A +sin c) = 2cosb + i2sin b cos a +cos c = 2 cos b sin a +sin c = 2 sin b

Again dy_2 =  3l cos [theta] {4 cos² [theta]  3} d [theta] =  3 {4 cos²
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"

Rachel Roy's grandmama style is interesting, who designs for her label cos it cant possibly be the same person.

First, Bush said "let's go in cos Saddam has WMDs", when none were found, he said, "well, he possessed the intent to make WMDs", when that did not wash, he said, "well, sadamm's regime was tyrannical and the is safer place".
Dems seize on 5 year anniversary of 'Mission Accomplished' speech

We can all laugh but wait till all them suicides starting rolling in cos they have lost all their (YOUR) moneyI remember 1987 and we were so busy on suicides and mispers that we got overtime out of it!!!! on October 10, 2008 at 8: 41 am  Reply Rogerborg

You are darn right, we chicken out of who we are or what we believe in cos of branding or tagging.

He cannot win cos he will not get the vote of the blue collar uneducated whites.

While Congress was negotiating a recovery package to bring our country out of the worst economic crisis since the Great Depression, some deficit hawks were promoting the notion that the shortterm cos ...

I just went right past my stop on the train cos I was so engrossed in doing this.
brandelion commented on the word cos
'cause, because
December 4, 2006