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  Dictionary Definition of sine

sine [1]
noun Mathematics.
1. a trigonometric function defined for an acute angle in a right-angled triangle as the ratio of the side opposite the angle to the hypotenuse, and defined for angles of any size as the ordinate of a point P, a unit distance from the origin O and such that OP is inclined at the given angle to the x -axis.
2. the function (of a real variable x ) defined as the sine of an angle of radian measure x; any extension of this function. Abbrev.: sin
[L sinus curve, used to translate Ar. jaib chord of an arc]