# Cosine

[koh-sahyn] /ˈkoʊ saɪn/

**noun**

1.

Trigonometry.

2.

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).

/ˈkəʊˌsaɪn/

**noun** (of an angle)

1.

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

n.

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

cosine

(kō’sīn’)

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

Tagged: c

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