'Infiltrate' definitions:

Definition of 'infiltrate'

From: WordNet
verb
Cause (a liquid) to enter by penetrating the interstices
verb
Enter a group or organization in order to spy on the members; "The student organization was infiltrated by a traitor" [syn: infiltrate, penetrate]
verb
Pass into or through by filtering or permeating; "the substance infiltrated the material"
verb
Pass through an enemy line; in a military conflict [syn: infiltrate, pass through]

Definition of 'Infiltrate'

From: GCIDE
  • 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]

Definition of 'Infiltrate'

From: GCIDE
  • Infiltrate \In*fil"trate\, v. t. To penetrate gradually; -- sometimes used reflexively. --J. S. Mill. [1913 Webster]

Synonyms of 'infiltrate'

From: Moby Thesaurus