Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “know”


noun     /nəʊ/
be in the know to have knowledge about something that not everyone knows: People in the know were sure the film would win an Oscar.Knowledge and awareness
(Definition of know noun from the Cambridge Learner's Dictionary © Cambridge University Press)

Definitions of “know” in other dictionaries

Word of the Day


a document given to students or reporters which contains information about a particular subject

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