#1 infiltrate v. cause (a liquid) to enter by penetrating the interstices. wn
#2 infiltrate v. [penetrate] enter a group or organization in order to spy on the members; "The student organization was infiltrated by a traitor". wn
#3 infiltrate v. pass into or through by filtering or permeating; "the substance infiltrated the material". wn
#4 infiltrate v. [pass through] pass through an enemy line; in a military conflict. wn
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