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

 

sine

 noun
noun
BrE BrE//saɪn//
 
; NAmE NAmE//saɪn//
 
(abbreviation sin)(mathematics) Mathematical terminology
 
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the ratio of the length of the side opposite one of the angles in a right-angled triangle that are less than 90° to the length of the longest side compare cosine, tangent See related entries: Mathematical terminology Word Origin late 16th cent.: from Latin sinus ‘curve’, used in medieval Latin as a translation of Arabic jayb ‘pocket, sine’.
See the Oxford Advanced American Dictionary entry: sine

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