Plain English Meaning
A built-in 'click' position that locks a lever or switch into a chosen setting so it doesn't drift or move on its own.
Full Definition
Mechanical stop positions built into a control or selector that hold it firmly in a specific setting until deliberately moved. In aviation, detents are felt as a distinct click or resistance point at fixed positions on items such as flap handles, fuel selectors, magneto switches, and throttle quadrants.
Context Anchor
Seen during preflight when checking cockpit controls, switches, handles, and levers for proper movement and secure positioning.