A blackout is a sudden loss of electricity in a town or city. If you experience a blackout, it's helpful to have flashlights and candles handy.

During a war or an energy crisis, a city may impose a blackout on its citizens, requiring them to turn off all lights and, during bombing raids, to cover windows and limit activity. There is also a figurative kind of blackout, when a government suppresses information deliberately, not allowing newspapers and TV stations to report what's really happening. Someone who faints or passes out experiences yet another kind of blackout, a loss of consciousness.

Definitions of blackout
  1. noun
    darkness resulting from the extinction of lights (as in a city invisible to enemy aircraft)
    synonyms: brownout, dimout
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    type of:
    dark, darkness
    absence of light or illumination
  2. noun
    the failure of electric power for a general region
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    type of:
    power failure, power outage
    equipment failure resulting when the supply of power fails
  3. noun
    a suspension of radio or tv broadcasting
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    type of:
    break, intermission, interruption, pause, suspension
    a time interval during which there is a temporary cessation of something
  4. noun
    a momentary loss of consciousness
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    type of:
    a state lacking normal awareness of the self or environment
  5. noun
    partial or total loss of memory
    “he has a total blackout for events of the evening”
    synonyms: amnesia, memory loss
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    show 7 types...
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    anterograde amnesia, posttraumatic amnesia
    loss of memory for events immediately following a trauma; sometimes in effect for events during and for a long time following the trauma
    retrograde amnesia
    loss of memory for events immediately preceding a trauma
    tendency to forget
    selective amnesia
    amnesia about particular events that is very convenient for the person who cannot remember
    transient global amnesia
    memory disorder seen in middle aged and elderly persons; characterized by an episode of amnesia and bewilderment that lasts for several hours; person is otherwise alert and intellectually active
    senior moment
    a momentary lapse of memory (especially in older people)
    posthypnotic amnesia
    selective amnesia after being in a hypnotic state of events occurring during hypnosis or of information designated by the hypnotist
    type of:
    cognitive state, state of mind
    the state of a person's cognitive processes
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