DECOMPRESSION
decompression, decompressing
(noun) relieving pressure (especially bringing a compressed person gradually back to atmospheric pressure)
decompression
(noun) restoring compressed information to its normal form for use or display
Source: WordNet® 3.1
Etymology
Noun
decompression (usually uncountable, plural decompressions)
The process of decompressing.
The restoration to atmospheric pressure of a person who has spent time under higher pressure (such as a diver)
Mode of operation of some internal combustion engines that makes them easier to start, but significantly increases fuel consumption.
(medicine) The relief of pressure on a body part by surgery
Source: Wiktionary