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A reduction or cutback in electric power, especially as a result of a shortage, a mechanical failure, or overuse by consumers.
1. (Electrical Engineering) a dimming or reduction in the use of electric lights in a city, esp to conserve electric power or as a defensive precaution in wartime
2. (Electrical Engineering) a temporary reduction in electrical power. Compare blackout3
3. (Computer Science) a temporary slowing down of the workings of the internet caused when too many users attempt to access it at the same time
any curtailment of electric power, esp. a voltage reduction to prevent a blackout.