radian

Noun

 * 1)   In the International System of Units, the derived unit of plane angular measure of angle equal to the angle subtended at the centre of a circle by an arc of its circumference equal in length to the radius of the circle. Symbol: rad.

Translations

 * Arabic:
 * Bulgarian: радиан
 * Catalan: radiant, radian
 * Chinese:
 * Mandarin:
 * Dutch:
 * Esperanto:
 * Finnish:
 * French:
 * Georgian:
 * German:
 * Greek:
 * Indonesian:
 * Irish: raidian
 * Italian:
 * Japanese:
 * Latvian: radiāns
 * Malay: radian
 * Polish:
 * Portuguese:
 * Romanian:
 * Russian:
 * Slovak: radián
 * Slovene: radian
 * Spanish:
 * Swedish:
 * Tagalog: radyan
 * Thai:
 * Turkish:
 * Welsh: radian

Etymology
.

Etymology
From + the suffix.

Noun

 * 1) radian

Etymology
.

Etymology
Equivalent to

Noun

 * a, an angular measure where pi radians = 180°