Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

  

English definition of “when”

when

adverb     /wen/
A1 used to ask at what time something happened or will happen : When's your birthday ? When did he leave ? When are you going away?Question words and expressions
(Definition of when adverb from the Cambridge Learner's Dictionary © Cambridge University Press)

Definitions of “when” in other dictionaries

Word of the Day

scramble

to mix eggs with a little milk and mix again as they are being fried

Word of the Day

Blog

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