Meaning of PERMEABILITY in English

PERMEABILITY

[noun] [U] [formal]Permeability is the ability of a substance to let gases or liquids go through it.Chalk has a high permeability (= It lets liquids pass through it easily).The treatment uses artificial fever to treat diseases and it has been shown to increase the permeability of the cell membrane.

Cambridge English vocab.      Кембриджский английский словарь.