verb (used with object), in·fil·trat·ed, in·fil·trat·ing. to filter into or through; permeate. to cause to pass in by filtering. to move into (an organization, country, territory, or the like) surreptitiously and gradually, especially with hostile intent: The troops infiltrated the enemy lines.

Is infiltrate a transitive verb?

1[transitive, intransitive] to enter or make someone enter a place or an organization secretly, especially in order to get information that can be used against it infiltrate something The headquarters had been infiltrated by enemy spies.

Can infiltrate be a noun?

The act or process of infiltrating, as of water into a porous substance, or of a fluid into the cells of an organ or part of the body. The substance which has entered the pores or cavities of a body. The act of entering a physical location and/or organization secretly.