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1.
a suspension of radio or tv broadcasting.
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2.
any darkness resulting from the extinction of lights.
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3.
the failure of electric power for a general region sufficient to extinguish all normal lighting.
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4.
a momentary loss of consciousness.
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5.
partial or total loss of memory.
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6.
a period during which artificial lighting is forbidden, as in a city as a precaution against an air raid.
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7.
the darkening of all stage lights, as at then end of a performance or between acts.(Theater)
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8.
suppression of information distribution; as, there was a blackout on news from the military for the first day of the Gulf War.
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9.
the prohibition of the broadcasting of a sports event, such as a boxing match or football game, sometimes confined to one particular area. It is usually done to encourage sales of tickets to the event.