lightning

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Concise Oxford English Dictionary © 2008 Oxford University Press:
lightning/ˈlʌɪtnɪŋ/
noun
  • 1 the occurrence of a brief natural high-voltage electrical discharge between a cloud and the ground or within a cloud, accompanied by a bright flash and often thunder.
  • 2 [as modifier] very quick: lightning speed.
– origin ME: special use of lightening (verbal noun from lighten2).
'lightning' also found in these Oxford entries:

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