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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
Newsweek
Word History
First Known Use
1879, in the meaning defined above
Time Traveler
The first known use of reflectivity was in 1879 👨🏻🏫 Mr. Ng 韋氏詞典 📚 – mw.mister5️⃣.net
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