It has meanings in both electromagnetism and chemistry/earth sciences. Permeability in electromagnetism in means how receptive a material is to magnetization. Permeability in earth sciences can mean how well a material such as rock can transmit fluids.

Permeability is the measure of the ability of a material to support the formation of a magnetic field within itself.(Degree of magnetization that a material obtains in response to an applied magnetic field.) It is represented by the Greek letter μ.

Characteristic of a material that is full of tiny connected airspace that water can seep through.

permeabiity