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Answer for USA, Canada and countries running a 60 Hertz supply service.
Not only house wiring but in any electrical installation it is an electrical term that refers to the amount of "voltage to ground" as compared to the term of "voltage to neutral". In troubleshooting scenario's one can not always be checking voltage points back to the neutral because of physical length from the neutral point. All legal electrical equipment connections are grounded. The ground is grounded at the neutral bar in the distribution panel making it a common point. Even though you can not always access a neutral in the field there will always be a "hot" voltage to metallic grounded equipment to check for voltage at that point. This makes troubleshooting faulty equipment much easier.
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