Definition
A narrow, carefully shaped gap built into a wing — typically near the leading edge — that allows higher-pressure air from beneath the wing to flow up and over the upper surface at high angles of attack. This re-energizes the airflow on top of the wing, delays the stall, and allows the wing to keep producing lift at slower speeds and steeper angles than it otherwise could.
Plain English
A small built-in gap in the wing that lets air from below sneak up to the top of the wing. This keeps the air flowing smoothly over the wing when flying slowly or at a steep nose-up angle, which helps prevent a stall.
Context Anchor
Seen in airframe maintenance and wing design discussions, especially when identifying fixed high-lift features on a wing.
Derivation
From the Old English 'slot,' meaning a narrow opening or groove. The aviation use keeps that plain meaning — it really is just a shaped opening cut through the wing.
Why Pilots Care
Slots affect how the aircraft behaves at low speeds and high angles of attack. An aircraft with slots will often stall later and more gently, which matters during takeoff, landing, and slow-flight maneuvering.
Intuition Check
A slot does not mean any random hole or cutout in the airplane. In this context, it means a specific airflow opening near the wing’s leading edge that helps the wing keep lifting at high angles.
Example Sentence 1
The wing's leading-edge slot helped the aircraft maintain controllability at low airspeeds during the short-field landing.
Example Sentence 2
During preflight, the mechanic checked the slots for ice or debris that could restrict the airflow they are designed to provide.