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[koh-sahyn] /ˈkoʊ saɪn/


Mathematics. (of a real or complex number x) the function cos x defined by the infinite series 1 − (x 2 /2!) + (x 4 /4!) − + …, where ! denotes factorial.
Abbreviation: cos.
Compare (def 3), (def 1).
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 cos

1630s, from co. sinus, abbreviation of Medieval Latin complementi sinus (see complement + sine).

Cooperation for Open Systems Interconnection Networking in Europe. A EUREKA project.


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