infiltration
Americannoun
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the act or process of infiltrating.
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the state of being infiltrated.
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something that infiltrates; an infiltrate.
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Military.
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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.
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a system of transporting troops or vehicles at extended and irregular intervals so as to avoid enemy observation or attack, especially from the air.
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Geology. the seepage of water into soil or rock.
Other Word Forms
- reinfiltration noun
Etymology
Origin of infiltration
First recorded in 1790–1800; infiltrate + -ion
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
One tactic was by far the most effective: infiltration.
From Salon • Feb. 15, 2026
His brigade is building up its midrange drone capabilities to hit Russian forces at up to 15 miles behind the front line, before they can launch infiltration attempts, he said.
From The Wall Street Journal • Feb. 9, 2026
California banned phones in public school classrooms beginning in January, largely in response to the infiltration of social media.
From Los Angeles Times • Feb. 9, 2026
Similar immune cell infiltration is seen in people who develop myocarditis after vaccination.
From Science Daily • Dec. 27, 2025
The infiltration of soldiers from North to South was steadily rising.
From "Most Dangerous: Daniel Ellsberg and the Secret History of the Vietnam War" by Steve Sheinkin
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
