the act or process of infiltrating.
the state of being infiltrated.
something that infiltrates; an infiltrate.
a method of attack in which small bodies of soldiers or individual soldiers penetrate the enemy's line at weak or unguarded points in order to assemble behind the enemy position and attack it from the rear, harass enemy rear-area installations, etc.
a system of transporting troops or vehicles at extended and irregular intervals so as to avoid enemy observation or attack, especially from the air.
Geology. the seepage of water into soil or rock. Compare percolation ( def 3 ).

1790–1800; infiltrate + -ion

reinfiltration, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
infiltrate (ˈɪnfɪlˌtreɪt)
1.  to undergo or cause to undergo the process in which a fluid passes into the pores or interstices of a solid; permeate
2.  military to pass undetected through (an enemy-held line or position)
3.  to gain or cause to gain entrance or access surreptitiously: they infiltrated the party structure
4.  something that infiltrates
5.  pathol any substance that passes into and accumulates within cells, tissues, or organs
6.  pathol a local anaesthetic solution injected into the tissues to cause local anaesthesia
[C18: from in-² + filtrate]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Cite This Source's 21st Century Lexicon
Main Entry:  infiltration
Part of Speech:  n
Definition:  See urban exploration's 21st Century Lexicon
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American Heritage
Medical Dictionary

infiltration in·fil·tra·tion (ĭn'fĭl-trā'shən)

  1. The act or process of infiltrating.

  2. The state of being infiltrated.

  3. The gas, fluid, or dissolved matter that has entered a substance, cell, or tissue.

in·fil'tra·tive (-trə-tĭv) adj.
The American Heritage® Stedman's Medical Dictionary
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Example sentences
They contained everything that was needed to support life underground and were
  virtually impervious to enemy infiltration.
From there, her infiltration was a feat of feverish social engineering.
Infiltration of criminal groups requires skills honed to a fine edge, and daily
  life exposed to peril.
And there has always been such a thing as infiltration.
Images for infiltration
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