1. A transient or continuous conduction of electricity through a gas by the formation and movement of electrons and ions in an applied electric field.
2. The flow of electricity through a gas, resulting in the emission of radiation that is characteristic of the gas and of the intensity of the current.
3. The removal of a charge from a battery, capacitor, or other electric-energy storage device.
4. The passage of electricity through a gas, usually accompanied by a glow, arc, spark, or corona.

1. An electric lamp in which the light comes from an electric discharge between two electrodes in a glass tube.
2. A lamp in which light is produced by an electric discharge between electrodes in a gas (or vapor) at low or high pressure.
3. A lamp that uses the transmission of an electric current through a gas or vapor to produce illumination. Neon, mercury and argon lamps are examples of electric-discharge lamps.
4. A lamp whose light is produced by current flow through a gas or vapor in a sealed glass enclosure.

Examples of these lamps include argon glow, mercury-vapor, neon glow, and sodium-vapor.

An evacuated enclosure (removal of gases and vapors) containing a gas at low pressure, through which current can flow when sufficient voltage is applied between metal electrodes in the tube.

A metal-cutting process in which high-frequency discharges from a negatively charged metal tool remove metal from the work piece by electroerosion.

There is no electrolyte, but the work is submerged in oil to flush away eroded particles and to delay each spark until peak energy is built up.>