n. The constant a in the Beer's law relation A = abc, where A is the absorbance, b the path length, and c the concentration of solution. Also known as absorptive power. Formerly known as absorbency index; absorption constant; extinction coefficient.
the GNU version of the Collaborative International Dictionary of English
n. Absorptiveness.
The Century Dictionary and Cyclopedia
n. The power or capacity of absorption.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. (physics) the property of a body that determines the fraction of the incident radiation or sound flux absorbed or absorbable by the body
Word Usage
"The absorptivity is the fraction of incident light power that is absorbed by the body/surface."