radian
ra·di·an
noun \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
First Known Use of RADIAN
1879
Learn More About RADIAN
Browse
Next Word in the Dictionary: radiance
Previous Word in the Dictionary: radial velocity
All Words Near: radian
Previous Word in the Dictionary: radial velocity
All Words Near: radian
Seen & Heard 
What made you want to look up radian? Please tell us where you read or heard it (including the quote, if possible).
