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Vinony

radian

noun

  1. SI unit of angular measure
L326290 on Wikidata ↗

Wiktionary

Pronunciation: /ˈɹeɪdiən/

noun

Etymology: Etymology tree Latin radiusbor. English radius Proto-Indo-European *-nós Proto-Italic *-nos Latin -nus Latin -ānus Old French -ainder. Middle English -an English -an English radian From radius + -an.

  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.