- Infiltrate is defined as to pass through gaps, particularly into enemy lines or in the case of liquid passing through a substance.
An example of to infiltrate is for an army to pass through weak points in the enemy's line and seize the enemy's city.
transitive verbinfiltrated, infiltrating
- to pass, or cause (a fluid, cell, etc.) to pass, through small gaps or openings; filter
- to pass through, as in filtering
- to pass, or cause (individual troops) to pass, through weak places in the enemy's lines in order to attack the enemy's flanks or rear
- to penetrate, or cause to penetrate (a region or group) gradually or stealthily, so as to attack or to seize control from within
Origin of infiltratein- + filtrate
verbin·fil·trat·ed, in·fil·trat·ing, in·fil·trates
- a. To pass (troops, for example) surreptitiously into enemy-held territory.b. To penetrate with hostile intent: infiltrate enemy lines; terrorists that had infiltrated the country.
- To enter or take up positions in gradually or surreptitiously, as for purposes of espionage or takeover: infiltrated key government agencies with spies.
- To cause (a liquid, for example) to permeate a substance by passing through its interstices or pores.
- To permeate (a porous substance) with a liquid or gas.
(third-person singular simple present infiltrates, present participle infiltrating, simple past and past participle infiltrated)