To enter or gain access to an organization, place, or system surreptitiously and gradually, especially in order to acquire secret information or cause damage.
The spy managed to infiltrate the enemy's headquarters without being detected.
To permeate or become a part of something gradually, often in a way that is not immediately noticeable.
Over time, new ideas began to infiltrate the traditional culture of the community.
infiltrateсуществительное
An abnormal substance or accumulation of cells or fluid that has passed into bodily tissue, often detected radiologically.
The radiologist noted a small infiltrate in the patient's right lung.