1) Absorption 2) Adsorption 1) Action 2) Activity 3) Natural action 4) Natural process 5) Surface assimilation 
Compare with adsorption and absorption. Assimilation of molecules of one substance by a material in a different phase. Adsorption (sorption on a surface) and absorption (sorption into bulk material) are two types of sorption phenomena.
Sorption refers to the action of both absorption and adsorption takes place simultaneously.
Sorption is a physical and chemical process by which one substance becomes attached to another. Specific cases of sorption are treated in the following articles: ...
Noncommittal term used instead of adsorption or absorption when it is difficult to discriminate experimentally between these two processes.
Adsorption or absorption. ... (05 Mar 2000) ... 
(sorp´shәn) the process or state of being sorbed; absorption or adsorption.
Type: Term Pronunciation: sōrp′shŭn Definitions: 1. Adsorption or absorption.
[n] - the process in which one substance takes up or holds another (by either absorption or adsorption)
The action of soaking up or attracting substances; process used in many pollution control systems. 
noun the process in which one substance takes up or holds another (by either absorption or adsorption)