Permeation

noun

1. The act of permeating, or the state of being permeated.
2. The act of permeating, passing through, or spreading throughout, the pores or interstices of any substance.
3. The movement of a fluid through a porous or permeable solid.
4. The spreading of something (especially something malignant) through the body via blood vessels etc.
5. the process of permeating or infusing something with a substance