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radian |
2 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Radian \Ra"di*an\, n. [From {Radius}.] (Math.) An arc of a circle which is equal to the radius, or the angle measured by such an arc. From WordNet r 1.6 [wn]: radian n : the unit of plane angle adopted under the System International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees) [syn: {rad}]
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