radian
English Thesaurus
1. 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) (noun.quantity)
| hypernym | : | angular unit, |
| definition | : | a unit of measurement for angles (noun.quantity) |
| part holonym | : | milliradian, |
| definition | : | a unit of angular distance equal to one thousandth of a radian (noun.quantity) |
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