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radian

ra·dian

UK/ˈɹeɪdiən/ uncommon

noun

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)

Synonyms

Origin

From radius + -an.

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Part of

WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.