B1
a sudden flash of light in the sky during a storm
Dictionary examples:
The lightning was so bright, I could see my neighbor's funny pajamas! (0.0)
The lightning scared my cat so much, she hid under the bed for hours. (0.0)
The lightning was so close, I thought my hair would stand up! (0.0)
That tree was struck by lightning. (26.5)
She changed her clothes with lightning speed. (28.1)
a flash of lightning (32.0)
thunder and lightning (37.4)