air

Concise Bible Dictionary:

1. ἀήρ, the fluid that we breathe, and which surrounds the earth. There are two remarkable references to the air: one, that at the Rapture of the saints the raised dead and the living will be caught up into the clouds, and will meet the Lord in the air (1 Thess. 4:1717Then we which are alive and remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord. (1 Thessalonians 4:17)), in the same sphere in which the Lord disappeared at His ascension. The other is that Satan is called the prince of the power of the air (Eph. 2:22Wherein in time past ye walked according to the course of this world, according to the prince of the power of the air, the spirit that now worketh in the children of disobedience: (Ephesians 2:2)), doubtless referring to the permeating character of the air, which we not only breathe, but it fills our houses and enters everywhere. When the air is tainted with malaria it permeates everywhere and poisons everything; so Satan has such power that his poisonous spirit morally contaminates everything in the world, of which he is the god.

Strong’s Dictionary of Greek Words:

Greek:
ἀήρ
Transliteration:
aer
Phonic:
ah-ayr’
Meaning:
from ἄημι (to breathe unconsciously, i.e. respire; by analogy, to blow); "air" (as naturally circumambient)
KJV Usage:
air. Compare 5594