filter meaning

[ 'filtə ] Pronunciation:   "filter" in a sentence
  • Verb: filter  filtu(r)
    1. Remove by passing through a filter
      "filter out the impurities"
      - filtrate, strain, separate out, filter out 
    2. Pass through
      - percolate, sink in, permeate 
    3. Run or flow slowly, as in drops or in an unsteady stream
      - trickle, dribble
    Noun: filter  filtu(r)
    1. Device that removes something from whatever passes through it 
    2. An electrical device that alters the frequency spectrum of signals passing through it 
    3. [Brit] A traffic light used to allow some of the traffic to turn off while the rest remains stopped

    Sounds like: philtre, philter

    Derived forms: filtered, filtering, filters

    See also: filtrate, filtration

    Type of: course, device, electrical device, feed, flow, penetrate, perforate, run, separate

    Encyclopedia: Filter

  • [Architecture]

    A device to separate solids, such as dust, from air.


    A device to separate solids from liquids.


    A charcoal filter.


    A layer or combination of layers of pervious materials designed and installed in such a manner as to provide drainage, yet prevent the movement of soil particles due to flowing water.


    See heat filter.


    See light filter.

  • [Business]
    noun, verb

    noun [C]

    (IT )

    a computer program that receives data and processes it according to particular rules before displaying it, or sending it somewhere to stop particular things from being seen:

    You can set up filters to manage your incoming and outgoing emails.

    We use a web filter to block access to certain websites.


    1 (IT ) [+ obj]

    (about a computer program) to process data according to particular rules before displaying it or sending it somewhere, for example in order to stop particular figures, text, etc. from being seen:

    The program filters web pages for unsuitable contents.

    Incoming emails are filtered into different mail boxes based on their subject.

    2 [no obj] (used with an adverb or a preposition)

    to have an effect on sth, especially in small amounts over a period of time:

    The economic recovery is beginning to filter through to the job market.

    The price increase has not yet filtered down into profits.


    filter sth out

    to remove sth that you do not want using a special device or system:

    The system filters out all junk emails.

    ◆ (figurative) The test is used to filter out candidates who may be unsuitable.

  • [Defence]
    (*) In electronics, a device which transmits only part of the incident energy and may thereby change the spectral distribution of energy: a.
    High pass filters transmit energy above a certain frequency; b.
    Low pass filters transmit energy below a certain frequency; c.
    Band pass filters transmit energy of a certain bandwidth; d.
    Band stop filters transmit energy outside a specific frequency band.

  • [Economics]
    = filter rule

    Any rule or set of rules regulating when to buy and sell securities.

  • [Electronics]
    1. A circuit or device that passes alternating currents at some frequencies while attenuating or
    blocking currents at other frequencies. Examples: BANDPASS FILTER, BAND-REJECTION FILTER, HIGH-PASS FILTER, and LOW-PASS FILTER.
    2. An inductance-capacitance (LC) or resistance-capacitance (RC) circuit for removing the ripple from the output of a power-supply rectifier.
    3. A transparent disk with special optical properties placed in front of a camera lens for a special photographic effect.
    4. A character patterned to control the elimination or selection of characters in another pattern.
    5. A device or program that separates information, according to certain specifications or characteristics.
    6. A machine word that specifies the elements to be treated in another machine word; also called MASK.

  • [Finance]
    A rule that stipulates when a security should be bought or sold according to its price action.

  • [Medicine]
    1 : a porous article or mass (as of paper or sand) through which a gas or liquid is passed to separate out matter in suspension
    2 : an apparatus containing a filter medium
    a : a device or material for suppressing or minimizing waves or oscillations of certain frequencies (as of electricity, light, or sound)
    b : a transparent material (as colored glass) that absorbs light of certain wavelengths or colors selectively and is used for modifying light that reaches a sensitized photographic material —called also color filter
    vb fil·tered; fil·ter·ing vt
    1 : to subject to the action of a filter
    2 : to remove by means of a filter
    ¦ vi : to pass or move through or as if through a filter

  • [Computer]
    1. (Originally Unix, now also MS-DOS) A program that processes an input data stream into an output data stream in some well-defined way, and does no I/O to anywhere else except possibly on error conditions; one designed to be used as a stage in a pipeline (see plumbing). Compare sponge.

    2. (functional programming) A higher-order function which takes a predicate and a list and returns those elements of the list for which the predicate is true. In Haskell:

     filter p filter p (x:xs) = if p x then x : rest else rest where rest = filter p xs 
    See also filter promotion.


    More:   Next
  1. the filter is now ready for operation.
  2. the particles can be collected on the filter paper.
  3. a filter traps dust from the air.
  4. filter selection is made using inherent spectra.
  5. the filters would have to absorb nearly all the energy.

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PC Version