|noun|
1.(in image-editing software) a function used to alter the overall appearance of an image in a specific manner.
‘many other apps also offer _filters_ for enhancing photos’
2.A device for suppressing electrical or sound waves of frequencies not required.
‘If one of the two obviously is higher than the other, adjust the related frequency _filters_ as needed.’
‘The second image-analysis method uses a 2-D frequency band-reject _filter_ .’
3.A filter tip.
‘a cheap _filter_ cigarette’
‘Cigarette _filters_ , which can last up to 100 years - are designed to absorb tar and other chemicals from the cigarette.’
4.A piece of software that processes data before passing it to another application, for example to reformat characters or to remove unwanted types of material.
‘Mr Porter said such _filters_ had been removed because they slowed down access to the Internet.’
‘Most search engines have duplication _filters_ in effect that look past formatting changes and do a very good job of detecting duplicate content.’
5.A porous device for removing impurities or solid particles from a liquid or gas passed through it.
‘an oil _filter_ ’
‘Because the _filter_ stops allergens from entering your body it prevents them triggering hay fever.’
6.A screen, plate, or layer of a substance which absorbs light or other radiation or selectively absorbs some of its components.
‘ _filters_ can be used in photography to reduce haze’
‘As a serious photography project, this is one time you do not need wide angle lenses, special _filters_ or off camera flash guns.’
7.A traffic light signalling a filter arrangement.
‘Good news for motorists - a _filter_ light for traffic existing from Athy Road on to the Main Street is also in the pipeline.’
‘Several traders suggested introducing a green _filter_ at the traffic lights in Cricklade Road to allow cars to turn right easier.’
8.An arrangement whereby vehicles may turn left (or right) while other traffic waiting to go straight ahead or turn right (or left) is stopped by a red light.
‘a _filter_ lane’
‘Looking at the points he lists I agree that there should be a visible, designated taxi rank at the top of town and his comments regarding roundabouts, traffic lights and _filter_ lanes are well founded.’
|verb|
1.(of information) gradually become known.
‘the news began to _filter_ in from the hospital’
‘You probably could hear it, as word _filtered_ back that he was in U.S. hands.’
2.(of light or sound) enter a place slowly or in small quantities.
‘sunlight _filtered_ in through the thin curtains’
‘Yesterday morning was beautiful, the sky was bright blue, it was warm and the sounds _filtering_ into our home were happy.’
3.(of traffic) be allowed to pass to the left or right at a junction while traffic going straight ahead is halted.
‘At 8am, traffic _filtered_ around the closed-off Cricklade Street smoothly, but as the morning wore on, vehicles began to build up in Devizes Road and Albert Street.’
‘The problem with the whole system is it is putting too much pressure on Main Street as the traffic cannot _filter_ through New Street anymore.’
4.Move slowly in a specified direction.
‘the players _filtered_ out on to the pitch’
‘Haley can occupy two blockers, allowing linebackers to _filter_ from behind to make plays.’
5.Pass (a liquid, gas, light, or sound) through a device to remove unwanted material.
‘the eye _filters_ out ultraviolet radiation’
‘We have been given a special machine for our living room which _filters_ pure oxygen into his lungs.’
6.Process or assess (items) in order to reject those that are unwanted.
‘you'll be put through to a secretary whose job it is to _filter_ calls’
‘the brain has the ability to _filter_ out information it considers non-essential’
7.Process or treat with a filter.
‘Of course, users may be tempted to _filter_ all server error messages, but that's not a reliable solution because doing so would also block legitimate mail server error messages.’
‘Alas, search engines have always _filtered_ by structure, rather than the message, and so they should.’
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