[co.se.cant] n [NL cosecant-, cosecans, fr. co- + secant-, secans secant] (ca. 1706) 1: a trigonometric function that for an acute angle is the ratio between the hypotenuse of a right triangle of which the angle is considered part and the leg opposite the angle
2: a trigonometric function csc A that is the reciprocal of the sine for all real numbers A for which the sine is not zero and that is exactly equal to the cosecant of an angle of measure A in radians