(n) the slow passage of a liquid through a filtering medium, Syn. infiltration, Example:the percolation of rainwater through the soil; the infiltration of seawater through the lava
n. [ L. percolatio. ] The act or process of percolating, or filtering; filtration; straining. Specifically (Pharm.), the process of exhausting the virtues of a powdered drug by letting a liquid filter slowly through it. [ 1913 Webster ]