decompression

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de|com|pres|sion /d'iːkəmpr'eʃən/
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] usu N n
Decompression is the process of bringing someone back to the normal pressure of the air after they have been deep underwater.
...a decompression chamber.

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