[{"Bold_text": "noun", "List Items": ["a brilliant electric spark discharge in the atmosphere, occurring within a thundercloud, between clouds, or between a cloud and the ground."]}, {"Bold_text": "verb (used without object)", "List Items": ["to emit a flash or flashes of lightning (often used impersonally withitas subject):If it starts to lightning, we'd better go inside."]}, {"Bold_text": "adjective", "List Items": ["of, relating to, or resembling lightning, especially in regard to speed of movement:lightning speed.lightning flashes;lightning speed."]}]