infiltrate.
To surreptitiously penetrate, enter or gain access to.
Meaning & usage
To surreptitiously penetrate, enter or gain access to.
The spy infiltrated the high-tech company and stole many secrets.
To cause to penetrate in this way.
The agency infiltrated several spies into the company.
To pass through something by filtration.
To cause (a liquid) to pass through something by filtration.
To invade or penetrate a tissue or organ.
High-grade tumors often infiltrate surrounding structures.
In certain conditions, immune cells may infiltrate into the cerebrospinal fluid.
To send (soldiers, spies, etc.) through gaps in the enemy line.
To move from a vein, remaining in the body.
Where this word comes from
From Middle English infiltrate (adjective), from Medieval Latin infiltrātus, from infiltrō.
Any undesirable substance or group of cells that has made its way into part of the body.
Where this word comes from
From Middle English infiltrate (adjective), from Medieval Latin infiltrātus, from infiltrō.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.