Absorption vs. Absorbance: What's the Difference?

Absorption and Absorbance Definitions
Absorption
The act or process of absorbing or the condition of being absorbed.
Absorbance
(physics) A logarithmic measure of the amount of light that is absorbed when passing through a substance; the capacity of a substance to absorb light of a given wavelength; optical density.
Absorption
A state of mental concentration.
Absorption
The act or process of absorbing or of being absorbed as,
Absorption
(obsolete) engulfing; swallowing up, as of bodies or land.
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Absorption
Assimilation; incorporation.
The absorption of a smaller tribe into a larger
The absorption of bodies in a whirlpool
Absorption
The imbibing or reception by molecular or chemical action, of radiant energy; the process of being neutrons being absorbed by the nucleus; interception.
The absorption of light, heat, electricity, etc.
Absorption
(meteorology) The process in which incident radiant energy is retained by a substance (such as an air mass) by conversion to some other form of energy (such as heat).
Absorption
(physiology) in living organisms, the process by which the materials of growth and nutrition are absorbed and conveyed to the tissues and organs; taking in by various means, such as by osmosis.
Absorption
Entire engrossment or occupation of the mind.
Absorption in some employment
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Absorption
Mental assimilation.
Absorption
(electrical engineering) The retaining of electrical energy for a short time after it has been introduced to the dielectric.
Absorption
The act or process of absorbing or sucking in anything, or of being absorbed and made to disappear; as, the absorption of bodies in a whirlpool, the absorption of a smaller tribe into a larger.
Absorption
An imbibing or reception by molecular or chemical action; as, the absorption of light, heat, electricity, etc.
Absorption
In living organisms, the process by which the materials of growth and nutrition are absorbed and conveyed to the tissues and organs.
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Absorption
Entire engrossment or occupation of the mind; as, absorption in some employment.
Absorption
(chemistry) a process in which one substance permeates another; a fluid permeates or is dissolved by a liquid or solid
Absorption
(physics) the process in which incident radiated energy is retained without reflection or transmission on passing through a medium;
The absorption of photons by atoms or molecules
Absorption
The social process of absorbing one cultural group into harmony with another
Absorption
The process of absorbing nutrients into the body after digestion
Absorption
Complete attention; intense mental effort
Absorption
The mental state of being preoccupied by something