Definition
A wing design that is supported entirely by its own internal structure, with no external bracing such as struts or wires. The wing is attached to the fuselage at the root and carries all flight loads through its internal spars, ribs, and skin.
Plain English
A wing that holds itself up from the inside, without any external supports running from the wing to the fuselage.
Context Anchor
Seen in aircraft design descriptions, especially when comparing wings with external struts to wings that have a clean, unbraced shape.
Derivation
From an old English building term meaning a beam fixed at one end and unsupported at the other -- like a shelf bracket sticking out from a wall. The aviation use carries the same idea: the wing is anchored only at the fuselage and extends outward without further support.
Why Pilots Care
Cantilever designs reduce drag and structural weight compared with braced wings, improving speed, fuel efficiency, and simplicity.
Analogy
Think of a diving board: it is fixed at one end and sticks out unsupported. A cantilever wing works the same way -- attached only at the fuselage, holding itself out into the air.
Intuition Check
Cantilever does not mean the wing has no support at all. It means the support is built into the wing and its attachment to the airplane, rather than coming from outside struts or wires.
Example Sentence 1
Most modern training aircraft use a cantilever wing, so you will not see struts running from the fuselage to the wing.
Example Sentence 2
During preflight the pilot inspected the cantilever wing root for any signs of stress or cracking.