What do a.m. and p.m. stand for?


[em-uh-siv-i-tee, ee-muh-] /ˌɛm əˈsɪv ɪ ti, ˈi mə-/
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.
Origin of emissivity
1875-80; emissive + -ity Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for emissivity
  • 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.
British Dictionary definitions for emissivity


/ɪmɪˈsɪvɪtɪ; ˌɛm-/
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 ε
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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