Reflectivity vs. Reflectance: What's the Difference?

Reflectivity and Reflectance Definitions
Reflectivity
The quality of being reflective.
Reflectance
The ratio of the total amount of radiation, as of light, reflected by a surface to the total amount of radiation incident on the surface.
Reflectivity
The ability to reflect.
Reflectance
(physics) The ratio of the flux reflected to that incident on a surface.
Reflectivity
(Physics) The ratio of the energy of a wave reflected from a surface to the energy possessed by the wave striking the surface.
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Reflectance
The fraction of radiant energy that is reflected from a surface
Reflectivity
(physics) The property or quality of being reflective.
Reflectivity
The fraction of radiant energy that is reflected from a surface
Reflectivity
The ability to reflect beams or rays