1 n-uncount Decompression is the reduction of the force on something that is caused by the weight of the air.
Decompression blew out a window in the plane.
2 n-uncount Decompression is the process of bringing someone back to the normal pressure of the air after they have been deep underwater.
usu N n
...a decompression chamber.
Translation English - Cobuild Collins Dictionary
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"