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1. WordNet® 3.0 (2006)
radian
    n 1: the unit of plane angle adopted under the Systeme
         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: radian, rad]
2. The Collaborative International Dictionary of English v.0.48
Radian \Ra"di*an\ (r[=a]"d[i^]*an), n. [From Radius.] (Math.)
   An arc of a circle which is equal to the radius, or the angle
   measured by such an arc.
   [1913 Webster] Radiance
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