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1. (n.) radian
the measure of a central angle subtending an arc equal in length to the radius: equal to 57.2958°.
Etymology: (1875–80)
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| Definition of 'radian' |
Princeton's WordNet |
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1. (noun) radian, rad
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)
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| Definition of 'radian' |
Webster Dictionary |
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1. (noun) radian
an arc of a circle which is equal to the radius, or the angle measured by such an arc
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| Definition of 'radian' |
The Standard Electrical Dictionary |
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1. radian
The angle whose arc is equal in length to the radius; the unit angle.
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Definitions of radian 
