Quick definitions from WordNet (lightning)
▸ noun: 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
▸ noun: abrupt electric discharge from cloud to cloud or from cloud to earth accompanied by the emission of light
▸ name: A surname (very rare: popularity rank in the U.S.: #50757)
▸ Also see lightning
▸ noun: 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
▸ noun: abrupt electric discharge from cloud to cloud or from cloud to earth accompanied by the emission of light
▸ name: A surname (very rare: popularity rank in the U.S.: #50757)
▸ Also see lightning