[em-uh-siv-i-tee, ee-muh-]
noun Thermodynamics.
the ability of a surface to emit radiant energy compared to that of a black body at the same temperature and with the same area.

1875–80; emissive + -ity

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World English Dictionary
emissivity (ɪmɪˈsɪvɪtɪ, ˌɛm-)
ε a measure of the ability of a surface to radiate energy; the ratio of the radiant flux emitted per unit area to that emitted by a black body at the same temperature

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Reflectivity and emissivity depend on the roof material, and the roofing calculators say nothing about emissivity, anyway.
Spectral emissivity is a key physical property in the determination of radiation transfer and balance.
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