- (uncountable, literary or poetic) The substance formerly supposed to fill#Verb|fill the upper#Adjective|upper regions of the atmosphere above the cloud#Noun|clouds, in particular as a medium#Noun|medium breathed by deities.
- (uncountable, physics, historical) Often as aether and more fully as luminiferous aether: a substance once thought to fill all unoccupied space#Noun|space that allowed electromagnetic waves to pass through it and interact with matter#Noun|matter, without exerting any resistance to matter or energy; its existence was disproved by the 1887 Michelson–Morley experiment and the theory of relativity propounded by Albert Einstein (1879–1955).
- (uncountable, colloquial) The atmosphere or space as a medium for broadcast#Verb|broadcasting radio and television signal#Noun|signals; also, a notional space through which Internet and other digital communications take place; cyberspace.
- (uncountable, colloquial) A particular quality#Noun|quality created by or surrounding an object#Noun|object, person, or place#Noun|place; an atmosphere, an aura.
- (uncountable, organic compound) Diethyl ether (Csub 4Hsub 10O), an organic compound with a sweet#Adjective|sweet odour used in the past as an anaesthetic.
- (countable, organic compound) Any of a class#Noun|class of organic compounds containing an oxygen atom bond#Verb|bonded to two hydrocarbon group#Noun|groups.
ether (ethers, present participle ethering; past and past participle ethered)
- (transitive, slang) To viciously humiliate or insult#Verb|insult.
- Synonyms: Thesaurus:abash
- The battle rapper ethered his opponent and caused him to slink away in shame.
- (Roman god) The god-personification of the bright, glowing upper air of heaven. He is the Roman counterpart of Aether.
- (Mormonism) The ancient American prophet of Mormon theology who wrote the Book of Ether in the Book of Mormon.
- Russian: Эфир
- Spanish: Éter