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1. (Science: chemistry) The accumulation or concentration of molecules of a gas or liquid on a surface in contact with the gas or liquid, resulting in a relatively high concentration of the gas or solution at the surface. Note that the accumulating molecules do not actually penetrate the substance they are on.

Compare: absorption.

2. (Science: virology) The adhesion of a substance to an organic particle in a solution, for example the adhesion of a virus to a cell.

Origin: L. Sorbere = to suck