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, aÃ«rial regions or currents. “AÃ«rial spirits.” Milton. “AÃ«rial 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, aÃ«rial spires.
4 Growing, forming, or existing in the air, as opposed to growing or existing in earth or water, or underground; as, aÃ«rial rootlets, aÃ«rial plants. Gray.
5 Light as air; ethereal. AÃ«rial acid, carbonic acid. [Obs.] Ure.