Radian Definition
 rādē-ən 
    noun
  
 The basic unit of plane angle in the SI system, equal to 57° 17′ 44.8″ (57.29578°, the angle formed at the center of a circle by two radii cutting off an arc whose length is equal to the radius of the circle): one degree equals 0.017454 radian and 360 degrees equals 2π radians.
 Webster's New World 
Synonyms: 
  Other Word Forms of Radian
Noun
Singular:
 radianPlural:
 radiansOrigin of Radian
radi(us) –an
From American Heritage Dictionary of the English Language, 5th Edition
From radi(us) + -an
From Wiktionary
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