Plain English Meaning
How hot the exhaust gases are coming out of the engine. Pilots watch this gauge to fine-tune how much fuel the engine is using.
Full Definition
The temperature of the exhaust gases as they leave the engine's cylinders, measured by a probe in the exhaust system. EGT reflects how completely and efficiently the fuel-air mixture is burning and is used by the pilot to lean the mixture for the most efficient power setting in cruise.
Context Anchor
Seen on engine instruments and in heat-management discussions, especially when adjusting mixture, climbing, or operating an engine under high power.