decompression
noun /ˌdiːkəmˈpreʃn/
  /ˌdiːkəmˈpreʃn/
 [uncountable]- a reduction in air pressure; the act of reducing the pressure of the air- decompression of the aircraft cabin
 
- a reduction in air pressure on a person who has experienced high pressure while diving deep underwater- Itching and rashes often occur following decompression.
 
- (computing) the process of expanding computer data to its normal size so that it can be read by a computer- The computers have built-in video decompression capabilities.