To enter by penetrating the pores or interstices of a substance; to filter into or through something.
To penetrate gradually; -- sometimes used reflexively.
Water moving downward through soil.
cause (a liquid) to enter by penetrating the interstices
If the gruound surface layer is porous and has minute passages available for the passage of water droplets, the water is then said to infiltrate the subsurface soil.
to penetrate through a porous tissue
To filter into; the penetration of water through soils.