emissivity

noun
emis·siv·i·ty | \ˌe-mə-ˈsi-və-tē, ˌē-ˌmi-ˈsi-\
plural emissivities

Definition of emissivity 

: the relative power of a surface to emit heat by radiation : the ratio of the radiant energy emitted by a surface to that emitted by a blackbody at the same temperature

First Known Use of emissivity

1880, in the meaning defined above

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The first known use of emissivity was in 1880

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emissivity

noun
emis·siv·i·ty | \ˌem-ə-ˈsiv-ət-ē, ˌē-ˌmis-ˈiv- \
plural emissivities

Medical Definition of emissivity 

: the relative power of a surface to emit heat by radiation : the ratio of the radiant energy emitted by a surface to that emitted by a blackbody at the same temperature

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