| NOUN | quantity | radian, rad | the unit of plane angle adopted under the Systeme International d'Unites |
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| Meaning | The unit of plane angle adopted under the Systeme 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). | |
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| Synonym | rad | |
| Parts | milliradian | A unit of angular distance equal to one thousandth of a radian |
| Broader | angular unit | A unit of measurement for angles |
| Spanish | radián | |
| Catalan | radian, rad | |
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