• A blackout is a large-scale disruption in electrical power.
• blackout can mean an episode of medical syncope (fainting).
• In theater, a blackout is the act of turning off all the stage lights, for some duration. Acts will frequently end with a blackout.
• In telecommunications, a blackout is when radio or telephone contact is not permitted or not possible.
• Similarly, a blackout is a regulatory ban on the broadcasting of an event. For instance, a television network may not be allowed to show a sporting event to a certain region.
• Blackout is also the name of a 1982 album by The Scorpions.
• Blackout is also the name of a 2003 album by Dropkick Murphys.
• Blackout is an alternative name for the card game Oh Hell.
• Blacking out can refer to completely forgetting what one did during a given period of time due to excessive drinking. It occurs when a person's blood alcohol level is sufficiently high to temporarily deactivate the part of the brain responsible for recording new memories.