Definitions from Wiktionary (infiltrate)

▸ verb:  (ambitransitive) To surreptitiously penetrate, enter or gain access to.
▸ verb:  (transitive) To cause to penetrate in this way.
▸ verb:  (ambitransitive, of a liquid) To pass through something by filtration.
▸ verb:  (transitive) To cause (a liquid) to pass through something by filtration.
▸ verb:  (ambitransitive, medicine) To invade or penetrate a tissue or organ.
▸ verb:  (transitive, military) To send (soldiers, spies, etc.) through gaps in the enemy line.
▸ verb:  (intransitive, of an intravenous needle) To move from a vein, remaining in the body.
▸ noun:  (pathology) Any undesirable substance or group of cells that has made its way into part of the body.

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