Definition of filters:
(n) :
A device which separates a suspended, dissolved, or particulate matter from a fluid, solution, or other substance; any device that separates one substance from another.
(n) :
Electronics or software that separates unwanted signals (for example noise) from wanted signals or that attenuates selected frequencies.
(n) :
Any item, mechanism, device, or procedure that acts to separate or isolate.
(v) :
(transitive) To sort, sift, or isolate.
(v) :
(transitive) To diffuse; to cause to be less concentrated or focused.
(v) :
(intransitive) To pass through a filter or to act as though passing through a filter.