Definition of cosine noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈkəʊsaɪn//
; NAmE NAmE//ˈkoʊsaɪn//
(abbreviation cos) (mathematics) Mathematical terminology
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the ratio of the length of the side next to an acute angle in a right-angled triangle to the length of the longest side (= the hypotenuse) compare sine, tangent See related entries: Mathematical terminology
See the Oxford Advanced American Dictionary entry: cosine