infiltration
/ˌɪnfəlˈtɹeɪʃən/ noun C1- The act or process of infiltrating, as of water into a porous substance, or of a fluid into the cells of an organ or part of the body.
- process by which water on the ground surface enters the soil.
- The substance which has entered the pores or cavities of a body.
- The act of secretly entering a physical location and/or organization.
Plural infiltrations
From the library
Residents experienced an inescapable infiltration of fine dirt, which coated their furniture, ruined their meals, and made breathing exceptionally difficult.
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