Meaning of SINE in English

SINE

/ saɪn; NAmE / noun

( abbr. sin ) ( mathematics ) 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

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WORD ORIGIN

late 16th cent.: from Latin sinus curve, used in medieval Latin as a translation of Arabic jayb pocket, sine.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.