Definition of cosine noun from the Oxford Advanced American Dictionary

 

cosine

 noun
noun
NAmE//ˈkoʊsaɪn//
 
(abbreviation cos)(mathematics)
 
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the ratio of the length of the side next to an acute angle in a right triangle to the length of the longest side (= the hypotenuse ) compare sine, tangent
See the Oxford Advanced Learner's Dictionary entry: cosine