# cosine

## Definitions

### Aviation

- noun a trigonometric function defined as the length of the side adjacent to an angle in a right-angled triangle divided by the length of the hypotenuse.

### Electronics

- For a right triangle, the
__ratio__ of the length of the side adjacent to an acute angle, to the length of the hypotenuse. This contrasts with sine, which is the ratio of the length of the side opposite to an acute angle, to the length of the hypotenuse.

### General Science

http://www.dictionarycentral.com/definition/cosine.html