What does aerial mean?
The definition of aerial
A*ë”ri*al, a.
Etym: [L. aërius. See Air.]

1 Of or pertaining to the air, or atmosphere; inhabiting or frequenting the air; produced by or found in the air; performed in the air; as, aërial regions or currents. “Aërial spirits.” Milton. “Aërial voyages.” Darwin.
2 Consisting of air; resembling, or partaking of the nature of air. Hence: Unsubstantial; unreal.
3 Rising aloft in air; high; lofty; as, aërial spires.
4 Growing, forming, or existing in the air, as opposed to growing or existing in earth or water, or underground; as, aërial rootlets, aërial plants. Gray.
5 Light as air; ethereal. Aërial acid, carbonic acid. [Obs.] Ure.

— Aërial perspective. See Perspective.