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English definition of “blackout”

blackout

noun [C] uk   /ˈblæk.aʊt/ us  

blackout noun [C] (HIDING)

a time when all lights must be hidden by law, or when there is no light or power because of an electricity failure: wartime blackouts Power lines were blown down and we had a blackout of several hours. the action taken to make certain that information about something is not reported to the public: a news blackout

blackout noun [C] (UNCONSCIOUSNESS)

a short period when someone suddenly becomes unconscious: He can't drive because he suffers from blackouts.
(Definition of blackout from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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