Permeability, permeable and semipermeable have several meanings:

• Permeability (electromagnetism), in electromagnetism, is the degree of magnetisation of a material in response to a magnetic field.
• Permeability (geology) in geology, is a measure of the ability of a material to transmit fluids through it.
• Permeability (soil science) in soil science, is a measure of the infiltration rate of precipitation into the soil.
• Semipermeable membrane, a membrane which will allow certain molecules or ions to pass through it by diffusion.
• Permeability tensor, permeability in an anisotropic medium.
• Vascular permeability, the movement of fluids and molecules between the vascular and extravascular compartments.

Permeabilitet | Permeabilität | Permeabiliteit | Permeabilitet | 透水性 | Permeabilidade | Permeabilnost | Perméabilitas