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radian
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English Dictionary: radian by the DICT Development Group
2 results for radian
From WordNet (r) 3.0 (2006) [wn]:
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)
    Synonym(s): radian, rad
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.
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