INFILTRATE

verb (-trated; -trating) Date: 1758 transitive verb to cause (as a liquid) to permeate something by penetrating its pores or interstices, to pass into or through (a substance) by filtering or permeating, to pass (troops) singly or in small groups through gaps in the enemy line, to enter or become established in gradually or unobtrusively usually for subversive purposes , intransitive verb to enter, permeate, or pass through a substance or area by filtering or by insinuating gradually, ~ noun infiltration noun infiltrative adjective infiltrator noun