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English definition of “lightning”

lightning

noun [U] uk   /ˈlaɪt.nɪŋ/ us  
B1 a flash of bright light in the sky that is produced by electricity moving between clouds or from clouds to the ground: thunder and lightning a flash of lightning That tree was struck by lightning. She changed her clothes with lightning speed (= extremely quickly).
(Definition of lightning from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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