What does absorption mean?
The definition of absorption
Ab*sorp”tion, n.
Etym: [L. absorptio, fr. absorbere. See Absorb.]

1 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.
2 (Chem. & Physics)
An imbibing or reception by molecular or chemical action; as, the absorption of light, heat, electricity, etc.
3 (Physiol.)
In living organisms, the process by which the materials of growth and nutrition are absorbed and conveyed to the tissues and organs.
4 Entire engrossment or occupation of the mind; as, absorption in some employment.