permeability

1. The property of being permeable. (uncountable)
2. The rate of flow of a fluid through a porous material. (uncountable)
3. A measure of the ability of a rock to transmit fluids (such as oil or water). (uncountable)
4. A quantitative measure of the degree of magnetization of a material in the presence of an applied magnetic field (measured in newtons per ampere squared in SI units). (uncountable)

الجمع permeabilities