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Radian

//ˈɹeɪdiən// noun

Definitions

Noun
  1. 1
    In the International System of Units, the derived unit of plane angle: the angle subtended at the centre of a circle by an arc of its circumference equal in length to the radius of the circle.
  2. 2
    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) wordnet

Etymology

From radius + -an.

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