 radian |
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| 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 |
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