From The Collaborative International Dictionary of English v.0.48 [gcide]:
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, a["e]rial regions or currents; the a["e]rial maneuvers of a fighter plane. "A["e]rial spirits." --Milton. "A["e]rial voyages." --Darwin.
4. Growing, forming, living, or existing in the air, as opposed to growing or existing in earth or water, or underground; as, a["e]rial rootlets, a["e]rial plants; the aerial roots of a philodendron. --Gray.
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