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infiltrate

[in-fil-treyt, in-fil-treyt] /ɪnˈfɪl treɪt, ˈɪn fɪlˌtreɪt/
verb (used with object), infiltrated, infiltrating.
1.
to filter into or through; permeate.
2.
to cause to pass in by filtering.
3.
to move into (an organization, country, territory, or the like) surreptitiously and gradually, especially with hostile intent:
The troops infiltrated the enemy lines.
4.
to pass a small number of (soldiers, spies, or the like) into a territory or organization clandestinely and with hostile or subversive intent:
The intelligence agency infiltrated three spies into the neighboring country.
verb (used without object), infiltrated, infiltrating.
5.
to pass into or through a substance, place, etc., by or as by filtering.
6.
Pathology. to penetrate tissue spaces or cells.
noun
7.
something that infiltrates.
8.
Pathology. any substance penetrating tissues or cells and forming a morbid accumulation.
Origin
1750-1760
1750-60; in-2 + filtrate
Related forms
infiltrative
[in-fil-trey-tiv, in-fil-truh-] /ˈɪn fɪlˌtreɪ tɪv, ɪnˈfɪl trə-/ (Show IPA),
adjective
infiltrator
[in-fil-trey-ter, in-fil-trey-] /ˈɪn fɪlˌtreɪ tər, ɪnˈfɪl treɪ-/ (Show IPA),
noun
reinfiltrate, verb, reinfiltrated, reinfiltrating.
uninfiltrated, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for infiltrate
  • Unperturbed by native cells, immune fighters roar into action when viruses or other foreigners infiltrate the body.
  • The basic idea of the new technology is to infiltrate this coating with tiny, fluid-filled capsules.
  • As you gun down policemen and infiltrate buildings with your buddies, the only question on your mind will be where to shoot next.
  • They infiltrate online courses and secretly collect information about students by blending in with them.
  • One promising technique borrows a page from the enemy's book, by employing the peptides that viruses use to infiltrate cells.
  • Empowered by a lack of natural enemies, invasive species often overwhelm the regions they infiltrate.
  • Our dwellings are teeming with chemicals that infiltrate our bodies.
  • So the paratroopers would infiltrate via helicopter, straight onto two of the highest peaks in the district.
  • According to the human-rights body, security agents infiltrate opposition groups to take control of them, stifling open politics.
  • Water that can't infiltrate the surface runs off the land instead, exacerbating erosion.
British Dictionary definitions for infiltrate

infiltrate

/ˈɪnfɪlˌtreɪt/
verb
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
noun
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
Derived Forms
infiltration, noun
infiltrative, adjective
infiltrator, noun
Word Origin
C18: from in-² + filtrate
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for infiltrate
v.

1758, of fluids, from in- (2) "in" + filtrate. Related: Infiltrated; infiltrating. Military sense of "penetrate enemy lines" attested from 1934.

Online Etymology Dictionary, © 2010 Douglas Harper
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infiltrate in Medicine

infiltrate in·fil·trate (ĭn-fĭl'trāt', ĭn'fĭl-)
v. in·fil·trat·ed, in·fil·trat·ing, in·fil·trates

  1. To cause a liquid to permeate a substance by passing through its interstices or pores.

  2. To permeate a porous substance with a liquid or gas.

n.
An abnormal substance that accumulates gradually in cells or body tissues.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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