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Definition of buffer noun from the Oxford Advanced Learner's Dictionary

buffer

noun
 
/ˈbʌfə(r)/
 
/ˈbʌfər/
Idioms
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  1. a thing or person that reduces a shock or protects somebody/something against difficulties
    • buffer against something Support from family and friends acts as a buffer against stress.
    • buffer between A and B She often had to act as a buffer between father and son.
    • The organization acts as a buffer between the management and the union.
    • a buffer state (= a small country between two powerful states that helps keep peace between them)
    • a buffer zone (= an area of land between two opposing armies or countries)
    • Peacekeepers have been sent in to establish a buffer zone between the rival forces.
    Oxford Collocations Dictionaryverb + buffer
    • act as
    • provide
    • use something as
    buffer + noun
    • state
    • zone
    preposition
    • buffer against
    • buffer between
    See full entry
  2. (British English) one of two round metal devices on the front or end of a train, or at the end of a railway track, that reduce the shock if the train hits somethingTopics Transport by bus and trainc2
  3. (computing) an area in a computer’s memory where data can be stored for a short time
  4. (also old buffer)
    (British English, old-fashioned, informal) an informal way of referring to an old man that shows that you do not respect him
  5. Word Originnoun senses 1 to 2 mid 19th cent.: probably from obsolete buff (verb), imitative of the sound of a blow to a soft body. noun sense 3 mid 18th cent.: probably from obsolete buff (imitative of the sound of a blow to a soft body), or from dialect buff ‘stutter, splutter’ (possibly the same word). In late Middle English buffer had the sense ‘stammerer’.
Idioms
hit the buffers
  1. (informal) if a plan, somebody’s career, etc. hits the buffers, it suddenly stops being successful
    • The former tennis star’s comeback trail hit the buffers yesterday when she lost in straight sets.
    Topics Difficulty and failurec2
See buffer in the Oxford Advanced American DictionarySee buffer in the Oxford Learner's Dictionary of Academic English

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alloy
noun
 
 
From the Topic
Physics and chemistry
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