permeability

This term describes a specific physical capacity for passage. It suggests a porous structure where there are gaps or channels that permit flow, rather than a solid barrier. It is most frequently used in scientific, geological, or biological contexts to describe the efficiency of a filter or a boundary.

Beyond physical science, the word is used to describe the openness of a system or a boundary to outside influence. A permeable border or a permeable organization is one that allows ideas, people, or information to flow in and out without rigid restriction, contrasting with a sealed or isolated environment.