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English definition of “sine”

sine

noun [C]     /saɪn/ (written abbreviation sin) specialized
(in a triangle that has one angle of 90°) the ratio of the length of the side opposite an angle less than 90° divided by the length of the hypotenuse (= the side opposite the 90° angle) → Compare cosine, tangentDescribing angles, lines and orientations
(Definition of sine noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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