1. a brilliant electric spark discharge in the atmosphere, occurring within a thundercloud, between clouds, or between a cloud and the ground.
verb (used without object), lightninged, lightning.
2. to emit a flash or flashes of lightning (often used impersonally with it as subject): If it starts to lightning, we'd better go inside. adjective
3. of, relating to, or resembling lightning, especially in regard to speed of movement: lightning flashes; lightning speed.
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