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

cosine

noun

cosine pronunciation English

ˈkəʊsaɪn

cosine pronunciation American

ˈkoʊsaɪn

(abbr. cos) (mathematics)

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