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. / A discharge of this kind.

Extremely fast or sudden; moving (as if) at the speed of lightning.

(impersonal, childish or nonstandard, intransitive) To produce lightning.

(archaic) plural of lightning

Third-person singular simple present indicative form of lightning

(volcanology, meteorology) Electrical discharge that occurs during a volcanic eruption, caused by a build-up of static electricity in colliding ejecta (such as ash and debris).

A firefly.

A metallic conductor that is attached to a high point of a building and leads to the ground to protect the building from damage by lightning.

A metallic conductor that is attached to a high point of a building and leads to the ground and protects the building from damage by lightning.

A device that provides an alarm to inform its user(s) that lightning has occurred nearby. Specific devices are available for a variety of applications.