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The Collaborative International Dictionary of English v.0.48:

Infiltrate \In*fil"trate\, v. i. [imp. & p. p. Infiltrated; p. pr. & vb. n. Infiltrating.] [Pref. in- + filtrate: cf. F, s'infiltrer. Cf. Infilter.] 1. To enter by penetrating the pores or interstices of a substance; to filter into or through something. [1913 Webster] The water infiltrates through the porous rock. --Addison. [1913 Webster] 2. To enter secretly (into an organization, territory, etc.) for hostile purposes, such as spying or sabotage; as, the FBI infiltrated into the U. S. communist party's upper echelons; also used transitively; as, to infiltrate the opponent's organization; to infiltrate one's agents into a hostile country. [PJC]