radian

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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

Recent Examples of radian from the Web

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First Known Use of radian

1879


Medical Dictionary

radian

play
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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