# Definition of radian

### Definitions

noun

Collins English Dictionary. Copyright © Harper Collins Publishers

### Word origin of 'radian'

C19: from radius## radian in Electrical Engineering*Powered by* COBUILD (reɪdiən) or rad

Word forms: (regular plural) radians

### Definitions

noun

(Electrical engineering: General) The radian is the plane angle between two radii of a circle that cut off on the circumference an arc equal in length to the radius. ⇒ The radian is the standard unit of angular measure, used in many areas of mathematics. ⇒ Since radians are a unit-less measurement the normalized angular frequency is sometimes referred to as inverse samples. ⇒ The radian is the plane angle between two radii of a circle that cut off on the circumference an arc equal in length to the radius.

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