RADIAN


Meaning of RADIAN in English

/ ˈreɪdiən; NAmE / noun

( geometry ) a unit used to measure an angle, equal to the angle at the centre of a circle whose arc is the same length as the circle's radius

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WORD ORIGIN

late 19th cent.: from radius + -an .

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