ra·di·an (r  d - n)n. Abbr. rad A unit of angular measure equal to the angle subtended at the center of a circle by an arc equal in length to the radius of the circle, approximately 57°17  44.6". See Table at measurement. |
radian
Noun
an SI unit of plane angle; the angle between two radii of a circle that cut off on the circumference an arc equal in length to the radius
| radian (rd-n) A supplementary unit of the International System used in angular measure. One radian is equal to the angle subtended at the center of a circle by an arc equal in length to the radius of the circle, approximately 57°17 44.6". |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. | radian - 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) angular unit - a unit of measurement for angles milliradian - a unit of angular distance equal to one thousandth of a radian |
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