Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “know”

See all translations

know

verb
 
/nəʊ/ (knew, known)
A1 to have information about something in your mind: “How old is she?” “I don’t know.” He knew that she was lying.
A1 used to ask someone to tell you a piece of information: Do you know where the post office is?
A2 to be certain: I know she’ll be really pleased to hear the news.
A2 to be able to do something: Do you know how to ski?
B1 to have spent time with someone or in a place so that the person or place is not new to you: I’ve known Al since we were children. I grew up in Brussels so I know it well.
let someone know A2 to tell someone something: Let me know if you’re going to the party.
I know used when you agree with something someone has just said: “It’s a lovely day, isn’t it?” “I know – let’s hope it lasts.”
you know B1 used to make sure someone understands which person or thing you are talking about: I was talking about Rachel – you know, the tall woman with the blond hair.
B1 ( also know about) If you know a subject, or you know about it, you are familiar with it and understand it: Ask Andy to fix it – he knows about computers.
be known as something B1 to be called: California is also known as the Sunshine State.
get to know someone/something B1 to gradually learn more about someone or something: I got to know Frank at work.
as far as I know used to say that you think something is true, but cannot be sure: As far as I know, he isn’t married.
(Definition of know from the Cambridge Essential Dictionary © Cambridge University Press)
Add Cambridge dictionaries to your browser to your website

More Essential British English definitions for “know”

Definitions of “know” in other dictionaries

Word of the Day

ice over

If an area of water ices over, it becomes covered with a layer of ice.

Word of the Day

Let’s celebrate! (words and phrases for parties)

by Kate Woodford,
December 17, 2014
​​​ With Christmas and New Year almost upon us, we thought it a good time to look at the language of parties and celebrations. First, let’s start with the word ‘party’ itself. To have or throw a party or, less commonly, to give a party is to arrange a party: We’re having a

Read More 

cinderella surgery noun

December 15, 2014
cosmetic surgery to the feet We have all heard of people having nose jobs, boob jobs and liposuction – but now a new trend growing in popularity in America: Cinderella surgery.

Read More