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|Noun||1.||surface assimilation - the accumulation of molecules of a gas to form a thin film on the surface of a solid|
chemisorption, chemosorption - adsorption (especially when irreversible) by means of chemical instead of physical forces; "chemisorption of gaseous nitrogen on iron catalysts"
sorption - the process in which one substance takes up or holds another (by either absorption or adsorption)