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".
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.