Definitions

1. 1.quintessence, aether (fifth alchemical element, or essence, after earth, air, fire, and water, that fills the universe beyond the terrestrial sphere)
2. 2.ether (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)
3. 3.ether (any of a class of organic compounds containing an oxygen atom bonded to two hydrocarbon groups)
4. 4.ether, diethyl ether (clear, colorless, highly flammable liquid with a low boiling point and chemical formula CH3-CH2-O-CH2-CH3; used as a solvent and, in the past, as a general anesthetic)
5. 5.air (substance constituting Earth's atmosphere, a gaseous mixture of nitrogen, oxygen, and various trace gases)

Forms