n.
Pronunciation: ( ˌ )k ō - ' s ē - ˌ kant, -k ə nt
Function: noun
Etymology: New Latin cosecant-, cosecans, from co- + secant-, secans secant
Date: circa 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 θ that is the reciprocal of the sine for all real numbers θ for which the sine is not zero and that is exactly equal to the cosecant of an angle of measure θ in radians