Infiltrate Definition
 ĭn-fĭltrāt, ĭnfĭl- 
  infiltrated, infiltrates, infiltrating
  
    verb
  
 
    infiltrated, infiltrates, infiltrating
  
To pass, or cause (a fluid, cell, etc.) to pass, through small gaps or openings; filter.
 Webster's New World 
To pass, or cause (individual troops) to pass, through weak places in the enemy's lines in order to attack the enemy's flanks or rear.
 Webster's New World 
To penetrate with hostile intent.
 Infiltrate enemy lines; terrorists that had infiltrated the country.
 American Heritage 
To pass through, as in filtering.
 Webster's New World 
To enter or take up positions in gradually or surreptitiously, as for purposes of espionage or takeover.
 Infiltrated key government agencies with spies.
 American Heritage 
    noun
  
 
    infiltrates
  
One that infiltrates, especially an abnormal substance that accumulates gradually in cells or body tissues.
 American Heritage Medicine 
Something that infiltrates.
 Webster's New World 
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