Filter meaning

fĭltər
The definition of a filter is something that separates solids from liquids, or eliminates impurities, or allows only certain things to pass through.

A Brita that you attach to your water faucet to remove impurities from your water is an example of a water filter.

When you stop to think about the impact of your words before you say them, this is an example of a filter between your brain and your mouth.

noun
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To remove by passing through a filter.

Filter out impurities.

verb
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To filter is defined as to remove impurities or unwanted material, to gradually leave a place or to gradually become known.

When you run water through a cloth to remove dirt and other debris, this is an example of a time when you filter water.

When you look through applications and weed out the ones you know your boss won't like, this is an example of a time when you filter.

When people slowly exit a movie theater after a show ends, this is an example of a time when they filter out of the theatre.

When news of the casualties after a plane crash starts to slowly become known, this is an example of a time when the news filters out.

verb
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To come or go gradually and in small groups.

The audience filtered back into the hall.

verb
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A device for separating solid particles, impurities, etc. from a liquid or gas by passing it through a porous substance.
noun
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To pass (a liquid or gas) through a filter.
verb
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(computers) A program or device that blocks e-mail or restricts website access when specific criteria are met.
noun
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(computers) To use a filter to block or restrict access to.

A program that filters spam.

verb
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To pass through or as if through a filter.

Light filtered through the blinds.

verb
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Any porous substance used or suitable for this, as sand, charcoal, felt, etc.
noun
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(comput.) Software variously designed to examine data, e-mail messages, etc. and to process, delete, block, etc. those satisfying certain criteria.

A spam filter that deletes spam sent to one's PC.

noun
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To pass through or as if through a filter.
verb
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To remove or separate by means of a filter.
verb
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To act as a filter for.
verb
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To pass through or as if through a filter.
verb
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To move or pass slowly.

The news filtered through town.

verb
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(informal) The ability or tendency to censor oneself, as to avoid causing embarrassment or offense.

My roommate has no filter and says whatever he's thinking at the moment.

noun
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To pass a liquid or gas through a filter.
verb
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To remove by passing through a filter.

Filter out impurities.

verb
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(informal) To censor oneself, as to avoid causing embarrassment or offense.
verb
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A material that has very tiny holes and is used to separate out solid particles contained in a liquid or gas that is passed through it.
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A device that allows signals with certain properties, such as signals lying in a certain frequency range, to pass while blocking the passage of others. For example, filters on photographic lenses allow only certain frequencies of light to enter the camera, while polarizing filters allow only light polarized along a given plane to pass. Radio tuners are filters that allow frequencies of only a narrow range to pass into an amplification circuit.
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A device that allows some signals to pass through but absorbs, attenuates, blocks, rejects, or removes all other signals, depending on their frequency (electrical) or wavelength (optical). Active filters require electrical power to operate, while passive filters do not. A low-pass filter passes all frequencies below a certain value, but blocks all others. A high-pass filter passes all frequencies above a certain value, but blocks all others.A band-pass filter passes all frequencies in a designated band, but blocks all others. See also absorption, active, attenuation, electrical, frequency, optical, passive, signal, and wavelength.
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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.
noun
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Electronics or software that separates unwanted signals (for example noise) from wanted signals or that attenuates selected frequencies.
noun
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Any item, mechanism, device or procedure that acts to separate or isolate.

He runs an email filter to catch the junk mail.

noun
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(mathematics, order theory) A non-empty upper set (of a partially ordered set) which is closed under binary infima (a.k.a. meets).

The collection of cofinite subsets of ℝ is a filter under inclusion: it includes the intersection of every pair of its members, and includes every superset of every cofinite set.

If (1) the universal set (here, the set of natural numbers) were called a "large" set, (2) the superset of any "large" set were also a "large" set, and (3) the intersection of a pair of "large" sets were also a "large" set, then the set of all "large" sets would form a filter.

noun
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(order theory): ultrafilter.
hyponyms
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To sort, sift, or isolate.
verb
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To diffuse; to cause to be less concentrated or focused.
verb
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(intransitive) To pass through a filter or to act as though passing through a filter.
verb
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(intransitive) To move slowly or gradually; to come or go a few at a time.
verb
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(intransitive) To ride a motorcycle between lanes on a road.
verb
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Origin of filter

  • Middle English filtre from Old French from Medieval Latin filtrum of Germanic origin pel-5 in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Old French filtre, from Medieval Latin filtrum, from Frankish *filtir, from Proto-Germanic *feltaz. See felt.

    From Wiktionary