Interpenetration

n.

1.

The act or process of penetrating between or within other substances; mutual penetration; also, the result of a process of interpenetration.

Noun	1.	interpenetration - the action of penetrating between or among
	2.	interpenetration - mutual penetration; diffusion of each through the other Synonyms: permeation

incursion, interpenetrate, penetration, permeate