1. A porous material through which a liquid or gas is passed in order to separate the fluid from suspended particulate matter.
2. A device containing such a material, especially one used to extract impurities from air or water.
3. any of various electric, electronic, acoustic, or optical devices used to reject signals, vibrations, or radiations of certain frequencies while allowing others to pass.
4. A colored glass or other transparent material used to select the wavelengths of light allowed to reach a photosensitive material.
5. computer science A program or routine that blocks access to data that meet a particular criterion: a web filter that screens out vulgar sites.
6. to pass (a liquid or gas) through a filter.
7. to remove by passing through a filter: filter out impurities.
8. computer science to use a filter to block access to (a website or web content).
9. to pass through or as if through a filter: light filtered through the blinds.
10. to come or go gradually and in small groups: the audience filtered back into the hall.

1. 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.
2. electronics or software that separates unwanted signals (for example noise) from wanted signals or that attenuates selected frequencies.
3. any item, mechanism, device or procedure that acts to separate or isolate.
4. A non-empty upper set (of a partially ordered set) which is closed under binary infima (a.k.a. meets).
5. to sort, sift, or isolate.
6. to diffuse; to cause to be less concentrated or focused.
7. to pass through a filter or to act as though passing through a filter.
8. to move slowly or gradually; to come or go a few at a time.
9. to ride a motorcycle between lanes on a road

1. any porous substance, as cloth, paper, sand, or charcoal, through which water or other liquid may passed to cleanse it from the solid or impure matter held in suspension; a chamber or device containing such substance; a strainer; also, a similar device for purifying air.
2. same as philter.
3. to pass through a filter; to percolate.
4. to purify or defecate, as water or other liquid, by causing it to pass through a filter.

1. to purify or defecate, as water or other liquid, by passing it through a filter or any cleansing medium; strain.
2. specifically in analytic chemistry, to separate (a solution) from the solid matter contained in it, either for the purpose of collecting and saving the solid matter, usually a precipitate, or of preparing the solution for further operations.
3. to percolate; pass through or as through a filter.
4. same as felter.
5. A device for arresting and separating any matter mechanically suspended in a liquid.
6. specifically in fish-culture, a long box in which screens, usually of flannel, are placed, through which the water is filtered before it passes into the hatching-troughs. also called filtering-box, filtering-tank.
7. see philter.

1. run or flow slowly, as in drops or in an unsteady stream
2. pass through
3. remove by passing through a filter
4. an electrical device that alters the frequency spectrum of signals passing through it
5. device that removes something from whatever passes through it