filter - definition and synonyms

noun [countable] 

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  1. 1
    science an object or piece of equipment that allows you to remove solid parts that are not wanted from a liquid or gas

    a water filter

  2. 2
    a glass or plastic object that you put on a camera to change the colour or amount of light that passes through the lens
  3. 3
    computing a computer program that prevents some types of information from appearing on your computer when you search the Internet