Meaning of cosine
Pronunciation: (kō'sīn), [key]
- (in a right triangle) the ratio of the side adjacent to a given angle to the hypotenuse.
- the sine of the complement of a given angle or arc. Abbr.: cos
- (of a real or complex number x) the function cos x defined by the infinite series 1 − (x/2!) + (x/4!) − + … , where ! denotes factorial. Abbr.: cos Cf. sine (def. 3),(def. 1).
- cosine (Thesaurus)