buffer - definition and synonyms

noun [countable] 

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  1. 1
    something that protects another thing by being between it and something else that could harm it

    The air bag acts as a buffer between the driver and the steering wheel.

    1. a.
      British one of two metal springs at the front and back of a train and at the end of a railway line that helps to protect the train if it crashes
  2. 2
    computing an area in a computer’s memory where information is kept temporarily when you are sending it from one system or program to another
  3. 3
    British informal a man, especially an old man, who you think is slightly stupid but not unpleasant

    a harmless old buffer

  4. 4
    something you use for polishing something, for example metal or your fingernails