In aircraft, an ejection seat (or ejector seat) is a system designed to rescue the pilot or other crew of an aircraft (usually military) in an emergency. In most designs, the seat is propelled out of the aircraft by an explosive charge or rocket motor, carrying the pilot with it. The concept of an ejectable escape crew capsule has also been tried.... Found on http://en.wikipedia.org/wiki/Ejection_seat
A seat fitted with an explosive charge and designed to eject the occupant clear of an aircraft during an in-flight emergency. Found on http://www.braeunig.us/space/glossary.htm