decompression

noun4

1. •
   The process of decompressing.

   • The decompression of large data files may take a while.
2. •
   The restoration to atmospheric pressure of a person who has spent time under higher pressure (such as a diver).
3. •
   The relief of pressure on a body part by surgery.
4. •
   A mode of operation of some internal combustion engines which reduces the engine's compression ratio, making it easier to start but significantly increasing fuel consumption.