Meaning of “radian” in the English Dictionary

american-english dictionary

(Definition of “radian” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"radian" in American English

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radiannoun [ C ]

us /ˈreɪ·di·ən/

geometry the measure of an angle at the center of a circle opposite an arc (= part of the edge of a circle) that is the same length as the radius (= line from the center to the edge of the circle)

(Definition of “radian” from the Cambridge Academic Content Dictionary © Cambridge University Press)