What does "absorptance" mean?

Absorbed radiation and incident radiation in a ratio format; a measurement that shows how well a surface absorbs radiation.

What is a synonym for "absorptance"?

Common synonyms include: absorption coefficient, coefficient of absorption.

Pronounced //əbˈzɔːp.tn̩s//.

/əbˈzɔːp.tn̩s/ noun

noun ·Rare ·Advanced level

Noun

1
Absorbed radiation and incident radiation in a ratio format; a measurement that shows how well a surface absorbs radiation.
2
a measure of the rate of decrease in the intensity of electromagnetic radiation (as light) as it passes through a given substance; the fraction of incident radiant energy absorbed per unit mass or thickness of an absorber wordnet

Circa 20th century, from absorption + -ance.