1. The reciprocal of the sine of an angle; the ratio of the hypotenuse to the opposite side in a right triangle.
Usage: mathematics; trigonometry; abbreviation of cosecant

Examples

• The cosec of 30 degrees equals 2.
• In trigonometry, cosec θ is defined as 1/sin θ.
• To find the cosec of an angle, divide the hypotenuse by the opposite side.
• The student calculated the cosec value using a scientific calculator.
• Cosec is less commonly used than sine or cosine in basic trigonometry.