"permeation" in the noun sense
1. permeation, pervasion, suffusion
the process of permeating or infusing something with a substance
2. interpenetration, permeation
mutual penetration diffusion of each through the other
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License