[ab-sawrp-tuhns, -zawrp-]
noun Physics, Optics.
the ratio of the amount of radiation absorbed by a surface to the amount of radiation incident upon it. Compare reflectance, transmittance ( def 2 ).

1930–35; translation of German Absorptionsvermögen. See absorption, -ance

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World English Dictionary
absorptance or absorption factor (əbˈsɔːptəns, -ˈzɔːp-)
physics reflectance Compare transmittance α 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
[C20: absorption + -ance]
absorption factor or absorption factor
[C20: absorption + -ance]

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Example sentences
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.
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