Definition
A device used in an aircraft to measure, display, or record information about the aircraft's condition, attitude, performance, or the operation of its systems. Examples include the airspeed indicator, altimeter, attitude indicator, heading indicator, vertical speed indicator, turn coordinator, engine instruments, and navigation instruments.
Plain English
A gauge or display in the cockpit that tells the pilot something they need to know — how fast the aircraft is flying, how high it is, which way it's pointing, or how the engine is doing.
Context Anchor
Seen on the instrument panel, during preflight checks, and in discussions about flying by using cockpit indications instead of outside visual cues.
Derivation
From the Latin instrumentum, meaning 'a tool' or 'implement.' An aircraft instrument is literally a tool the pilot uses to know what the aircraft is doing.
Why Pilots Care
Instruments supply the information needed for safe flight, especially when outside visual references are unavailable.
Intuition Check
Instrument does not mean a musical instrument here. In aviation, it means a gauge, screen, display, or other cockpit device that gives the pilot useful flight or system information.
Example Sentence 1
During the preflight check, the pilot scanned each instrument to confirm it was reading correctly before starting the engine.
Example Sentence 2
During the instrument scan the student noticed a slight drop in oil pressure.