American English

Definition of filter noun from the Oxford Advanced American Dictionary



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  1. 1 a device containing paper, sand, chemicals, etc. that a liquid or gas is passed through in order to remove any materials that are not wanted an air/oil filter a coffee/water filter He smokes cigarettes without filters.
  2. 2a device that allows only particular types of light or sound to pass through it The camera has an anti-glare filter.
  3. 3(computing) a program that stops particular types of electronic information, e-mail, etc. from being sent to a computer
See the Oxford Advanced Learner's Dictionary entry: filter