Dictionary

radian

noun ra·di·an \ˈrā-dē-ən\

Definition of RADIAN

:  a unit of plane angular measurement that is equal to the angle at the center of a circle subtended by an arc whose length equals the radius or approximately 57.3 degrees
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First Known Use of RADIAN

1879
Medical Dictionary

radian

noun ra·di·an \ˈrād-ē-ən\

Medical Definition of RADIAN

:  a unit of plane angular measurement that is equal to the angle at the center of a circle subtended by an arc equal in length to the radius

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