Definition of "percolation" [per•co•la•tion]

• The seepage or filtration of a liquid through a porous substance (noun)

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• "Many, many authors insist that frivolous mental percolation is critical for maintaining mental health."
• "If percolation is too fast, effluent will drain unfiltered (without removing bacteria) into the water table."
• "What a pretty example of opportunistic branching, also known as percolation, in physics."