Relating to or resembling ether; extremely light, delicate, and airy; heavenly or spiritual in quality, seeming almost not of this world.
From Latin 'aetherius,' derived from Greek 'aither' (upper air, pure sky, ether). The meaning evolved from a physics term into a poetic descriptor of anything celestial or insubstantial.
This is why we call wireless technology 'ethereal'—the ancient Greeks imagined a mysterious invisible substance (aether) filling the heavens, and the word still captures that sense of invisible, weightless mystery.
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