# 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