reflectance
re·flec·tance
noun \ri-ˈflek-tən(t)s\Definition of REFLECTANCE
: the fraction of the total radiant flux incident upon a surface that is reflected and that varies according to the wavelength distribution of the incident radiation —called also re*flec*tiv*i*ty, \ˌrē-ˌflek-ˈti-və-tē, ri-\
First Known Use of REFLECTANCE
1926
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