noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   In 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.
2. 2
   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) wordnet

Synonyms

All synonyms

rad

Etymology

From radius + -an.

Related phrases

derived unitinternational system of units

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.