absorptance

Absorptance (a) is ratio of the radiant or luminous flux in a given spectral interval absorbed in a medium to that of the incident radiation. Also called absorption factor.
Found on http://www.ktf-split.hr/periodni/en/abc/a.html

Absorptance

The ratio of the radiation absorbed by a surface to the total energy falling on that surface described as a percentage.
Found on http://www.neo.ne.gov/statshtml/glossarya.htm

Absorptance

The ratio of solar energy absorbed by a surface to the solar energy striking it.
Found on http://solarexpert.com/Glossary.html

absorptance

ratio of the absorbed radiant or luminous flux to the incident flux under specified conditions unit: 1
Found on http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=845-04-75
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