Radian (noun)

A unit of measurement for angles, equal to about 57.3 degrees.

Origin:

From french radian, from latin radius "a ray".

Examples:

1. A circle has 2π radians, which is approximately 6.28 radians.
2. The angle of elevation of an object can be measured in radians.
3. The speed of a rotating object can be calculated in radians per second.
4. Radians are used in mathematics and physics to describe angles and rotations.
5. A radian is a more natural unit of measurement for angles than degrees.