Definition of decompression noun from the Oxford Advanced American Dictionary

     

    decompression

     noun
    noun
    NAmE//ˌdikəmˈprɛʃn//
     
    [uncountable]
     
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  1. 1a reduction in air pressure; the act of reducing the pressure of the air a decompression chamber (= a piece of equipment that divers sit in so that they can return slowly to normal air pressure after being deep in the ocean) decompression sickness (= severe pain and difficulty in breathing experienced by divers who come back to the surface of deep water too quickly) see also bend (2)
  2. 2(technology) the act or process of allowing something that has been compressed (= made smaller) to fill the space that it originally took up The computers have built-in video decompression capabilities.
See the Oxford Advanced Learner's Dictionary entry: decompression