Invisibility

Invisibility is the ability to render oneself unseen to the naked eye.

Definition(s)
Invisibility is the state of an object that cannot be seen. Since objects can be seen by light in the visible spectrum from a source reflecting off their surfaces and hitting the viewer's eye, the most natural form of invisibility is an object that neither reflects nor absorbs light (that is, it allows light to pass through it). This is known as transparency, and is seen in many naturally-occurring materials.

Marvel Comics

 * Magneto (via Photokinesis)