The fraction of incident light that is reflected in all directions from an uneven surface: An albedo can be caused especially by the surface of the Earth, another planet, or by a satellite. .

An albedo is expressed as aTfraction of the solar radiation that is reflected back into space.

An albedo is the ratio of the amount of light reflected from an object in all directions to the amount of incident light.

An albedo of 1.0 corresponds to a perfect reflector.