infiltrate
1. [ verb ] cause (a liquid) to enter by penetrating the interstices
Related terms: percolate percolate percolation
2. [ verb ] pass into or through by filtering or permeating
Examples:

"the substance infiltrated the material"

Related terms: percolate percolate percolation
3. [ verb ] enter a group or organization in order to spy on the members
Synonyms: penetrate
Examples:

"The student organization was infiltrated by a traitor"

Related terms: join infiltration
4. [ verb ] (military) pass through an enemy-line; in a military conflict
Synonyms: pass_through
Related terms: pass infiltration
Similar spelling:   infiltrator
  infiltration
  inviolate
  inbuilt
  infielder
  inability
  in_flight