radian

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noun ra·di·an \ˈrā-dē-ən\

Definition of radian

  1. :  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

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'radian'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of radian

1879


Medical Dictionary

radian

play
noun ra·di·an \ˈrād-ē-ən\

Medical Definition of radian

  1. :  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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