infiltration
//ˌɪnfɪlˈtreɪʃən//
Noun
infiltrationSingular
infiltrationsPlural
1
The act or process of secretly entering or gaining access to an organization, place, or system, especially to obtain information or cause damage.
The spy's infiltration of the enemy organization took several months.
2
The gradual movement of water or other liquid into soil, rock, or another porous material.
The infiltration of rainwater into the soil helps replenish groundwater supplies.
3
The accumulation of abnormal substances or cells in body tissues, especially in medical contexts.
The CT scan revealed infiltration of cancer cells into the surrounding tissue.