Search Result for "radian": 
Wordnet 3.0

NOUN (1)

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]



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


WordNet (r) 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]