Mr - Definition from Longman English Dictionary Online

Mr British English ; Mr. American English See pronunciation table in "How to use dictionary" pages

1 used before a man's family name to be polite when you are speaking to him, writing to him, or talking about him:

Mr Smith is the headteacher.

Mr. John Smith

Mr and Mrs Smith

2 used when speaking to a man in an official position:

Mr Chairman

Mr. President

Mr Right

a man who would be the perfect husband for a particular woman:

She's finally found Mr. Right.

informalSCC the leader or most important person in a group, especially a criminal group

informal someone who is honest and always obeys the law

spoken used humorously to say that someone has a particular quality or behaves in a particular way:

I don't think we need any comments from Mr Sarcasm here.

Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

Dictionary pictures of the day

Do you know what each of these is called?

Click on any of the pictures above to find out what it is called.