Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “lightning”


noun [U] uk   /ˈlaɪt.nɪŋ/ us  
B1 a flash of bright light in the sky that is produced by electricity moving between clouds or from clouds to the ground: thunder and lightning a flash of lightning That tree was struck by lightning. She changed her clothes with lightning speed (= extremely quickly).Stormy weatherWind and winds
(Definition of lightning from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of lightning?
Add Cambridge dictionaries to your browser to your website

Definitions of “lightning” in other dictionaries

Word of the Day


an alcoholic drink made from apples

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More