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FILTER

Definition:

[noun] device that removes something from whatever passes through it
[noun] an electrical device that alters the frequency spectrum of signals passing through it
[verb] remove by passing through a filter; "filter out the impurities"
Synonyms: filtrate, strain, separate out, out
[verb] pass through; "Water permeates sand easily"
Synonyms: percolate, sink in, permeate
[verb] run or flow slowly, as in drops or in an unsteady stream; "water trickled onto the lawn from the broken hose"; "reports began to dribble in"
Synonyms: trickle, dribble