noun The substance formerly supposed to fill the upper regions of the atmosphere above the clouds, in particular as a medium breathed by deities. The medium breathed by human beings; the air. The sky, the heavens; the void, nothingness.
noun The medium breathed by human beings; the air.
noun The sky, the heavens; the void, nothingness.
noun Often as aether and more fully as luminiferous aether: The hypothetical substance permeating space, functioning as a medium for electromagnetic waves to propagate through, and which does not exert resistance to the movement of matter; its existence is incompatible with Einstein's theory of relativity; famously found to be undetectable by the 1887 Michelson–Morley experiment.
noun The atmosphere or space as a medium for broadcasting radio and television signals; also, a notional space through which Internet and other digital communications take place; cyberspace.
noun A particular quality created by or surrounding an object, person, or place; an atmosphere, an aura.
noun Diethyl ether (C4H10O), an organic compound with a sweet odour used in the past as an anaesthetic.
noun Any of a class of organic compounds containing an oxygen atom bonded to two hydrocarbon groups.