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Noun: depressurization  dee,pre-shu-ru'zey-shun [N. Amer], dee,pre-shu-rI'zey-shun [Brit]
  1. Loss of pressurization; a reduction of atmospheric pressure within a chamber or aircraft, etc.
    "The pilot responded quickly to the sudden depressurization of the cabin";
    - depressurisation [Brit]

Derived forms: depressurizations

Encyclopedia: Depressurization