(ancient philosophy and alchemy, uncountable) A classical physical element, considered as prevalent in the heavens and inaccessible to humans. In some versions of alchemy, this was the fifth element in addition to air, earth, fire and water.
(physics) A substance (aether) once thought to fill all space that allowed electromagnetic waves to pass through it and interact with matter, without exerting any resistance to matter or energy (disproved by Einstein in his Theory of Relativity).
“Jenkinson's opening movement stressed the majesty rather than the feathery etherealness, but throughout the work musicality flowed through and through.”
“She has a woman's hands, a woman's comportment, a woman's slender etherealness.”
“There's an attempt at blurry, glowy etherealness.”