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Latin word aether comes from Proto-Indo-European *h₂ey-dʰh₁-
*h₂ey-dʰh₁- (Proto-Indo-European)
αἴθω (Ancient Greek)
αἰθήρ (Ancient Greek)
aether (Latin)
The air or sky; light of day. The brightness or ethereal matter surrounding a deity. The upper world, the earth (as opposed to the lower world). The upper, pure, bright air; ether; the heavens.