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verb [with object]
1enter or gain access to (an organization, place, etc.) surreptitiously and gradually, especially in order to acquire secret information:other areas of the establishment were infiltrated by fascists permeate or become a part of (something) by infiltration:computing has infiltrated most professions now Medicine (of a tumor, cells, etc.) spread into or invade (a tissue or organ). 2(of a liquid) permeate (something) by filtration:virtually no water infiltrates deserts such as the Sahara introduce (a liquid) into something by filtration:lignocaine was infiltrated into the wound
an infiltrating substance or a number of infiltrating cells.