Definition: Meaning of, radian in English to English dictionary.
Pronunciation:/ ˈreɪdɪən /
noun
synonym
antonym
Word Forms:
Singular
Plural
radian
radians
approximately 57.295 degrees the unit of plane angle adopted under the Système International d'Unités; equal to the angle at the centre of a circle subtended by an arc equal in length to the radius