Etymology
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cosecant (n.)

in trigonometry, 1706, from co, short for complement, + secant.

updated on April 04, 2018

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Definitions of cosecant from WordNet

cosecant (n.)
ratio of the hypotenuse to the opposite side of a right-angled triangle;
Synonyms: cosec
From wordnet.princeton.edu, not affiliated with etymonline.