noun A flash of light produced by short-duration, high-voltage discharge of electricity within a cloud, between clouds, or between a cloud and the earth.
Although we did not see the lightning, we did hear the thunder.
noun A discharge of this kind.
The lightning was hot enough to melt the sand.
noun Anything that moves very fast.
noun Gin.
noun Obsolete form of lightening.
adjective Extremely fast or sudden; moving (as if) at the speed of lightning.