<p><strong>Verb</strong></p><ul><li>(used with object) To filter into or through; permeate.</li><li>To cause to pass in by filtering.</li><li>To move into (an organization, country, territory, or the like) surreptitiously and gradually, especially with hostile intent: The troops infiltrated the enemy lines.</li><li>To pass a small number of (soldiers, spies, or the like) into a territory or organization clandestinely and with hostile or subversive intent: The intelligence agency infiltrated three spies into the neighboring country.</li></ul><p><strong>Noun</strong></p><ul><li>Something that infiltrates.</li><li>(Pathology) Any substance penetrating tissues or cells and forming a morbid accumulation.</li></ul><p><strong>End of Response</strong></p>