- to filter into or through; permeate.
- to cause to pass in by filtering.
- to move into (an organization, country, territory, or the like) surreptitiously and gradually, especially with hostile intent: The troops infiltrated the enemy lines.
- 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.
- to pass into or through a substance, place, etc., by or as by filtering.
- Pathology. to penetrate tissue spaces or cells.
- something that infiltrates.
- Pathology. any substance penetrating tissues or cells and forming a morbid accumulation.
Origin of infiltrate
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for infiltrate
In 2008 Cromartie talked to The Gathering about the need to “infiltrate” secular media.The $1-Billion-a-Year Right-Wing Conspiracy You Haven’t Heard Of
September 25, 2014
I suppose we could infiltrate the government and do nothing.Up To A Point: My Problem With People Who Agree With Me
P. J. O’Rourke
July 20, 2014
Police sources confirm that the Millers conspired to infiltrate an unidentified court building and execute public officials.Hatriot Politics Created the Las Vegas Killers
June 10, 2014
But she was also having daily conversations with her OSI handlers about which drug rings she should try to infiltrate.Spies, Lies, and Rape in the Air Force: An Undercover Agent's Story
March 4, 2014
Jason White was a convicted felon from North Dakota who managed to infiltrate the Los Angeles Art world, until he snapped.Gallery Owner Accused of Cyberstalking Members of L.A.’s Art Scene
February 13, 2014
But the aliens were trying to infiltrate and every sentry post was vital.Two Timer
We have been able to infiltrate most of their organizations.Warren Commission (4 of 26): Hearings Vol. IV (of 15)
The President's Commission on the Assassination of President Kennedy
I can infiltrate and exfiltrate any room on this campus, D. You've seen me do it.Little Brother
The cancer, instead of appearing as a circumscribed tumor, may infiltrate diffusely the gastric walls, and so escape detection.
Fibrin, or the elements which compose it, also escapes to infiltrate the mucous membrane and remain upon its surface.
- to undergo or cause to undergo the process in which a fluid passes into the pores or interstices of a solid; permeate
- military to pass undetected through (an enemy-held line or position)
- to gain or cause to gain entrance or access surreptitiouslythey infiltrated the party structure
- something that infiltrates
- pathol any substance that passes into and accumulates within cells, tissues, or organs
- pathol a local anaesthetic solution injected into the tissues to cause local anaesthesia
C18: from in- ² + filtrate
Word Origin and History for infiltrate
Online Etymology Dictionary, © 2010 Douglas Harper
- To cause a liquid to permeate a substance by passing through its interstices or pores.
- To permeate a porous substance with a liquid or gas.
- 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.