# cosine

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## co·sine

(kō′sīn′)*n.*

*Abbr.*

**cos**

**1.**In a right triangle, the ratio of the length of the side adjacent to an acute angle to the length of the hypotenuse.

**2.**The abscissa at the endpoint of an arc of a unit circle centered at the origin of a Cartesian coordinate system, the arc being of length

*x*and measured counterclockwise from the point (1, 0) if

*x*is positive or clockwise if

*x*is negative.

## cosine

(ˈkəʊˌsaɪn)(of an angle)

*n* (Mathematics) 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. Abbreviation:

**cos**[C17: from New Latin

*cosinus;*see co-, sine^{1}]## co•sine

(ˈkoʊ saɪn)*n.*

**a.**(in a right triangle) the ratio of the side adjacent to a given angle to the hypotenuse.

## co·sine

(kō′sīn′) The ratio of the length of the side adjacent to an acute angle of a right triangle to the length of the hypotenuse.

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Noun | 1. | cosine - ratio of the adjacent side to the hypotenuse of a right-angled trianglecircular function, trigonometric function - function of an angle expressed as a ratio of the length of the sides of right-angled triangle containing the angle |

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