cosecant noun. [kǝʊ'si:k(ǝ)nt, -'sɛk-] E18.
[mod. Latin cosecant-: see CO-, SECANT.]
Math. The secant of the complement of a given angle; in a right-angled triangle containing the angle, the ratio of the hypotenuse to the side opposite the angle. Abbreviation COSEC.

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