1. • 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
   • verb - pass through
   • verb - run or flow slowly, as in drops or in an unsteady stream
2. • A porous material through which a liquid or gas is passed in order to separate the fluid from suspended particulate matter.
   • A device containing such a substance.
   • Any of various electric, electronic, acoustic, or optical devices used to reject signals, vibrations, or radiations of certain frequencies while passing others.
   • To pass (a liquid or gas) through a filter.
   • To remove by passing through a filter: filter out impurities.
   • To pass through or as if through a filter: Light filtered through the blinds.
   • To come or go gradually and in small groups: The audience filtered back into the hall.
3. • v - to pass through a filter (a device for removing suspended matter)

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