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

in a right-angled triangle: a ratio of the length of the adjacent side to the length of the hypotenuse.

Cooperation for Open Systems Interconnection Networking in Europe. European project financed by the European Community (EC) to build a communication network between scientific and industrial entities in Europe. The project ended in 1994.

Abbreviation for Cooperation for Open Systems Interconnection Networking in Europe. Note: COSINE is a program sponsored by the European Commission, aimed at using OSI (Open Systems Interconnection) to tie together European research networks. [After Bahorsky]

In a right triangle, the ratio of the length of the adjacent side to the length of the hypotenuse.

In a triangle, the cosine of an angle = (length of the adjacent side)/(hypotenuse) cotangent

Cooperation for Open Systems Interconnection Networking in Europe

(n) ratio of the adjacent side to the hypotenuse of a right-angled triangle

n. "kinsman, blood relative; closely related thing," s.v. cousin OED. KEY: cosine@n

n 28 cosyn 24 cosynes 1 cosyns 3

The ratio of the side adjacent to an acute angle of a plane right triangle to the hypotenuse. The expression NATURAL COSINE is sometimes used to distinguish the cosine from its logarithm (called LOGAR [..]