- (in a right triangle) the ratio of the hypotenuse to the side opposite a given angle.
- the secant of the complement, or the reciprocal of the sine, of a given angle or arc. Abbreviation: csc
- (of an angle) a trigonometric function that in a right-angled triangle is the ratio of the length of the hypotenuse to that of the opposite side; the reciprocal of sine
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