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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