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Filter

ˈfɪltə

Filter definitions
noun
filter filters
  1. a porous device for removing impurities or solid particles from a liquid or gas passed through it

    "an oil filter"

    • a filter tip on a cigarette

      "a cheap filter cigarette"

    • 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"

    • a device for suppressing electrical or sound waves of frequencies not required
    • (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"

    • 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
  2. 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"

    • a traffic light signalling a filter arrangement
verb
filter filtered filtering filters
  1. pass (a liquid, gas, light, or sound) through a device to remove unwanted material

    "the eye filters out ultraviolet radiation"

    • 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"

    • process or treat with a filter
  2. move slowly in a specified direction

    "the players filtered out on to the pitch"

    • (of light or sound) enter a place slowly or in small quantities

      "sunlight filtered in through the thin curtains"

    • (of information) gradually become known

      "the news began to filter in from the hospital"

    • (of traffic) be allowed to pass to the left or right at a junction while traffic going straight ahead is halted