Lightning definition

Lightning

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WordNet

noun

(1) The flash of light that accompanies an electric discharge in the atmosphere (or something resembling such a flash); can scintillate for a second or more

(2) Abrupt electric discharge from cloud to cloud or from cloud to earth accompanied by the emission of light

WiktionaryText

Noun

The flash of light caused by the discharge of atmospheric electrical charge.
The discharge of atmospheric electrical charge itself.

That tree was hit by lightning.

Adjective

Extremely fast or sudden.
Moving at the speed of lightning.