Definition of "infiltrate" []

  • To pass (troops, for example) surreptitiously into enemy-held territory. (verb-transitive)
  • To penetrate with hostile intent: infiltrate enemy lines; terrorists that had infiltrated the country. (verb-transitive)
  • To enter or take up positions in gradually or surreptitiously, as for purposes of espionage or takeover: infiltrated key government agencies with spies. (verb-transitive)
  • To cause (a liquid, for example) to permeate a substance by passing through its interstices or pores. (verb-transitive)
  • To permeate (a porous substance) with a liquid or gas. (verb-transitive)
  • To undergo or cause to undergo the process in which a fluid passes into the pores or interstices of a solid; permeate (verb)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

  • To pass undetected through (an enemy-held line or position) (verb)
  • To gain or cause to gain entrance or access surreptitiously (verb)
  • Something that infiltrates (noun)
  • Any substance that passes into and accumulates within cells, tissues, or organs (noun)
  • A local anaesthetic solution injected into the tissues to cause local anaesthesia (noun) (c) HarperCollins Publishers Ltd 2016

Use "infiltrate" in a sentence
  • "This first episode picks up where "Half-Life 2" ended: the towering alien fortress you and female friend Alyx managed to infiltrate is about to blow in a very big way."
  • "Don't want to reveal my plan but is the word infiltrate appropriate?"
  • ""The use of the word infiltrate to refer to a child reeks of small minded bigotry.""