reflectivity
noun
: the reflective quality or power of a surface or material
… conducting "reflectivity tests" to see whether Saudi sand when viewed through the goggles creates a sparkling effect that disorients pilots and causes them to send their helicopters careening to the ground.—Newsweek
… there are many examples of luster-decorated ceramics, in which Islamic potters emulated the reflectivity of metalwork by applying metal oxides to white-glazed vessels …—Roberta Smith
The warming at the surface could be expected to melt snow and ice, reducing the earth's albedo, or reflectivity.—Roger Revelle
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Merriam-Webster unabridged
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