[ 'ɪnfɪltreɪt ]
■ verb
1》 surreptitiously and gradually enter or gain access to (an organization, place, etc.).
2》 permeate by filtration.
■ noun Medicine an infiltrating substance or group of cells.
Derivatives
infiltration noun
infiltrator noun
Origin
ME (as infiltration ): from in- 2 + filtrate .