Meanings
nounradian (plural radians)
plural radians
- geometryIn the International System of Units, the derived unit of plane angle: the angle subtended at the centre of a circle by an arc of its circumference equal in length to the radius of the circle.
Synonyms & antonyms
nounthe 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)
Similar
Broader
angular unit
Also see
Synonym sets from Open English WordNet, CC BY 4.0.
Origin
Translations
Bulgarian радиан
- радиан (radian)unit
Catalan radiant, radian
- radiantunit
- radianunit
Chinese Mandarin 弧度
- 弧度 (húdù)unit
Dutch radiaal
- radiaalunit
Finnish radiaani
- radiaaniunit
French radian
- radianunit
German Radiant
- Radiantunit
Greek ακτίνιο
- ακτίνιο (aktínio)unit
Indonesian radian
- radianunit
Irish raidian
- raidianunit
Italian radiante
- radianteunit
Japanese ラジアン
- ラジアン (rajian)unit
Latvian radiāns
- radiānsunit
Malay radian
- radianunit
Polish radian
- radianunit
Portuguese radiano
- radianounit
Romanian radian
- radianunit
Russian радиан
- радиан (radian)unit
Slovak radián
- radiánunit
Spanish radián
- radiánunit
Swedish radian
- radianunit
Tagalog radyan
- radyanunit
Thai เรเดียน
- เรเดียน (ree-dîian)unit
Turkish radyan
- radyanunit
Welsh radian
- radianunit
Rhymes & wordplay
Rhymes with radian
All rhymes →Anagrams
Cite this entry
APA
radian. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/radian
MLA
“radian.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/radian. Accessed November 3, 2026.
Chicago
WatkinsX Dictionary, s.v. “radian,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/radian.
Source: radian on Wiktionary, CC BY-SA 4.0.