What is a steradian?

What is a steradian? Here are some definitions.

Noun
  1. (geometry) In the International System of Units, the derived unit of solid angle; the solid angle subtended at the centre of a sphere of radius r by a portion of the surface of the sphere that has area r2. Symbol: sr
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There are also two supplementary units, the radian, and the steradian.
This is the power of the light that is emitted per projected surface area into a given solid angle, and it is measured in watts per square metre per steradian.

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