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[pur-kuh-ley-shuh n] /ˌpɜr kəˈleɪ ʃən/
the act or state of percolating or of being percolated.
Pharmacology. the extraction of the soluble principles of a crude drug by the passage of a suitable liquid through it.
Geology. the slow movement of water through the pores in soil or permeable rock.
Origin of percolation
1605-15; < Latin percōlātiōn- (stem of percōlātiō). See percolate, -ion Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for percolation
  • Nor does your supposedly scientific discussion go into the older methods such as boiling and percolation.
  • The engineer will evaluate the soils, perform a percolation test if necessary, and design the septic system.
  • Maintenance of the pond bottom to improve percolation will be done as needed following annual inspection.
  • The slowest percolation rate of the three trials is used for design.
  • Measurements of percolation were available only from one cell and no data on evapotranspiration were available.
  • Within the park are two new percolation ponds that will receive about a million gallons of equipment cooling water each day.
  • The percolation rate can be used to determine the type and size of system needed.
  • The percolation number is the number which determines the amount of active cells.
Word Origin and History for percolation

1610s, from Latin percolationem (nominative percolatio), noun of action from past participle stem of percolare "to strain through, filter," from per- "through" (see per) + colare "to strain," from colum "a strainer" (see colander).

Online Etymology Dictionary, © 2010 Douglas Harper
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