1. • noun - a suspension of radio or tv broadcasting
   • noun - darkness resulting from the extinction of lights (as in a city invisible to enemy aircraft)
   • noun - the failure of electric power for a general region
   • noun - a momentary loss of consciousness
   • noun - partial or total loss of memory
2. • The concealment or extinguishment of lights that might be visible to enemy aircraft during an air raid.
   • Lack of illumination caused by an electrical power failure.
   • The sudden extinguishment of all stage lights in a theater to indicate the passage of time or to mark the end of an act or a scene.
   • A short, comic vaudeville skit that ends with lights off.
   • A temporary loss of memory or consciousness.
   • A suppression, as of news, by censorhip.
   • The central meaning shared by these nouns is “a temporary loss of consciousness”: suffers blackouts at high altitudes; fell in a dead faint at the sight of the cadaver; sank to the ground in a swoon; was taken to the emergency room in a state of syncope.
3. • n - a power failure

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