Definition
The process of maintaining a higher air pressure inside an aircraft cabin than the outside atmospheric pressure at altitude, allowing occupants to breathe normally and remain comfortable during flight at altitudes where the outside air is too thin to support normal respiration.
Plain English
Pumping air into the cabin so it stays denser than the thin air outside, letting people breathe and feel okay at high altitudes.
Context Anchor
Seen in high-altitude aircraft systems and in air data computer discussions where outside air pressure must be measured accurately.
Derivation
From 'pressure' plus the suffix '-ization' meaning 'the process of making something so.' Literally, the process of putting something under pressure -- in this case, the cabin air.
Why Pilots Care
Maintains adequate oxygen availability for crew and passengers without supplemental oxygen, preventing hypoxia and ensuring comfort and safety above 10,000 feet.
Grounding Statement
As an aircraft climbs, outside air gets thinner; pressurization keeps the air inside the aircraft closer to what people are used to breathing at lower altitudes.
Intuition Check
Pressurization does not mean the airplane is simply adding oxygen. It means the aircraft is controlling air pressure inside a cabin or compartment.
Example Sentence 1
After climbing through 18,000 feet, the crew confirmed the pressurization system was holding cabin altitude at 6,500 feet.
Example Sentence 2
On descent the pressurization controller slowly raised the cabin altitude to equalize with the field elevation before landing.