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[ab-sawrp-tuh ns, -zawrp-] /æbˈsɔrp təns, -ˈzɔrp-/
noun, Physics, Optics.
the ratio of the amount of radiation absorbed by a surface to the amount of radiation incident upon it.
1930-35; translation of German Absorptionsvermögen. See absorption, -ance Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for absorptance
  • Emittance and absorptance are obtained indirectly through combining the reflectance and transmittance under identical conditions.
  • Optical properties include transmittance, reflectance, and absorptance properties.
  • The frequency of the laser source beam is swept through a frequency range, including the expected maximum absorptance frequency.
British Dictionary definitions for absorptance


/əbˈsɔːptəns; -ˈzɔːp-/
(physics) a measure of the ability of an object to absorb radiation, equal to the ratio of the absorbed radiant flux to the incident flux. For a layer of material the ratio of the flux absorbed between the entry and exit surfaces of the layer to the flux leaving the entry surface is the internal absorptance α Compare reflectance, transmittance
Word Origin
C20: absorption + -ance
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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