It was absolutely horrible going up the hills 'cos they were really, really steep.
regional note: in AM, use 'cause
cos in British English1
or cos lettuce (kɒs)
noun
a variety of lettuce with a long slender head and crisp leaves
Usual US and Canadian name: romaine. Compare cabbage lettuce
Word origin
C17: named after Kos, the Aegean island of its origin
cos in British English2
(kɒz)
abbreviation for
cosine
cosine in British English2
(ˈkəʊˌsaɪn)
noun(of an angle)
a trigonometric function that in a right-angled triangle is the ratio of the length of the adjacent side to that of the hypotenuse; the sine of the complement
Abbreviation: cos
Cos in British English
(kɒs)
noun
a variant spelling of Kos
COS in British English
abbreviation for
Chief of Staff
Chief of Staff in British English
noun
1.
the senior staff officer under the commander of a major military formation or organization
2.
the senior officer of each service of the armed forces
Abbreviation: C of S, COS
COS in American English
cash on shipment
Cos in American English1
(kɑs; kɔs)
Latin
Kos
Cos in American English2
1.
companies
2.
counties
cos in American English1
(kɑs; kɔs)
noun Latin
romaine
: also cos lettuce
Word origin
after Cos1, whence orig. imported
cos in American English2
1.
cash on shipment
2.
companies
3. TrigonometryMathematics
cosine
4.
counties
Examples of 'cos' in a sentence
cos
During the summer it sends up large green leaves rather like an open cos lettuce.
Kitto, Dick Planning the Organic Vegetable Garden (1986)
How do they know cos they're invisible.
The Sun (2009)
Shred a large handful of cos lettuce and place in bowl with 100g of cooked lean chicken cut into chunks.
The Sun (2008)
Go for the jugular cos you know they'll be back to empty our pockets again very, very soon.