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infiltration (countable and uncountable, plural infiltrations)

  1. 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.
  2. The substance which has entered the pores or cavities of a body.
    • Kirwan
      calcareous infiltrations filling the cavities
  3. The act of secretly entering a physical location and/or organization.