radian | ||
1. | [ noun ] the unit of plane angle adopted under the System International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees) | |
Synonyms: | rad | |
Related terms: | angular_unit milliradian | |
Similar spelling: |
ratan Radin rattan ration radon radium |