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)

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.

• "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.""