AskEraser  |  Settings
Ask.com   
 
sine (sīn)

[Medieval Latin sinus (mistranslation of Arabic jayb, sine) (as if jayb, fold in a garment), from Latin, curve, fold.]

noun 

  1. The ordinate of 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.
  2. In a right triangle, the ratio of the length of the side opposite an acute angle to the length of the hypotenuse.