Meaning of "know" in Essential American English Dictionary


verb us /noʊ/ past tense knew, past participle 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 Boston, 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 beautiful 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 Webster's Essential Mini Dictionary © Cambridge University Press)