Infiltrate

English Meaning

To enter by penetrating the pores or interstices of a substance; to filter into or through something.

1. To pass (troops, for example) surreptitiously into enemy-held territory.
2. To penetrate with hostile intent: infiltrate enemy lines; terrorists that had infiltrated the country.
3. To enter or take up positions in gradually or surreptitiously, as for purposes of espionage or takeover: infiltrated key government agencies with spies.
4. To cause (a liquid, for example) to permeate a substance by passing through its interstices or pores.
5. To permeate (a porous substance) with a liquid or gas.
6. To gain entrance gradually or surreptitiously.
7. One that infiltrates, especially an abnormal substance that accumulates gradually in cells or body tissues.