Groundings

noun

1. Fundamental knowledge or background in a field or discipline.
2. The return to a fully conscious state after a psychedelic experience.
3. The collision of a ship with ground beneath the surface of the water.
4. The prevention of aircraft takeoff because of government action.
5. The interconnecting metal chassis/frame of a device, appliance, machine, or metal raceway via a designated conductor to earth at the service panel. It may be bare or covered, and does not carry current in normal operation.