Plain English Meaning
The wing is the part of the airplane that holds it up in the air. As the airplane moves forward, air flowing around the wing creates an upward push strong enough to lift the whole aircraft.
Full Definition
The wing is the primary lift-producing surface of an airplane, shaped and mounted so that air flowing over and under it generates an upward force that supports the aircraft in flight. Its shape (airfoil), area, and angle to the relative wind determine how much lift and drag it produces at a given airspeed.
Context Anchor
Seen in aerodynamics, aircraft control, and instrument flying discussions about how an airplane stays flying and responds to .