Plain English Meaning

The back edge of the wing, out near the tip. It's the part of the wing farthest from the body of the airplane along its rear edge.

Full Definition

The rear edge of the wing in the section located farthest from the fuselage, near the wingtip. This is the area where ailerons are typically mounted.

Context Anchor

Seen in wing and aileron descriptions, especially when explaining where roll-control surfaces are located.

Derivation

Outboard' means away from the centerline of the aircraft (toward the wingtip), the opposite of 'inboard.' '' is the rear edge of the wing — the edge that 'trails' behind as the aircraft moves forward. Together they pinpoint a corner of the wing: rear edge, near the tip.