Pronunciation: (presh'u-rīz"),[key] —v.t.,-ized, -iz•ing. 1. to raise the internal atmospheric pressure of to the required or desired level: to pressurize an astronaut's spacesuit before a walk in space. 2. to maintain normal air pressure in (the cockpit or cabin of an airplane) at high altitudes.
3. to apply pressure to (a gas or liquid); supercharge.
4. to pressure-cook. Also,esp. Brit.,pres'sur•ise".