Definition
An instrument used to measure and display the value of a physical quantity such as pressure, temperature, quantity, or position. In aviation, gauges are the cockpit instruments that show the pilot the current state of an engine, system, or aircraft parameter.
Plain English
A device that measures something and shows you the reading, like the dials and indicators on the instrument panel that tell you fuel level, oil pressure, or engine temperature.
Context Anchor
Seen on the instrument panel, in engine instrument checks, and in aircraft operating instructions.
Derivation
From Old French 'gauge,' meaning a standard measure or measuring rod. The aviation use carries the same idea: a tool that gives you a measured reading against a known scale.
Why Pilots Care
Gauges are how the pilot stays informed about what the aircraft and its systems are doing. A misread or ignored gauge can mean missing the early warning of a developing problem.
Intuition Check
Do not read gauge as “make a rough guess.” In aviation, a gauge is the instrument or display that shows a measured value.
Example Sentence 1
The oil pressure gauge dropped below the green arc, so the pilot diverted to the nearest airport.
Example Sentence 2
Throughout the climb the oil pressure gauge remained steady within the normal operating range.