filtration

Noun
  1. is a type of: action, activity, natural action, natural process - a process existing in or produced by nature (rather than by the intent of human beings)
    subtypes: infiltration, percolation - the slow passage of a liquid through a filtering medium
  2. is a type of: change - the action of changing something
    subtypes: percolation - the filtration of a liquid for extraction or purification

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