Learn how to say Infiltration correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word infiltrate:
to undergo or cause to undergo the process in which a fluid passes into the pores or interstices of a solid; permeate
(military) to pass undetected through (an enemy-held line or position)
to gain or cause to gain entrance or access surreptitiously ⇒ they infiltrated the party structure
something that infiltrates
(pathology) any substance that passes into and accumulates within cells, tissues, or organs
(pathology) a local anaesthetic solution injected into the tissues to cause local anaesthesia