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English definition of “sine”

sine

noun [C]    /sɑɪn/ (abbreviation sin)
trigonometry in a triangle that has one angle of 90°, the ratio (= relationship) 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)
(Definition of sine noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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