infiltration

About 4.24 uses per million words.

Meaning

1. noun 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.
2. noun process by which water on the ground surface enters the soil.
3. noun The substance which has entered the pores or cavities of a body.
4. noun The act of secretly entering a physical location and/or organization.

Similar words

permeation permeability percolation seepage filtering leak leaching filtration leakage flow

Often followed by

of and in into is by with rate or