There are 2 definitions of Mr in English:

Mr1

Line breaks: Mr
Pronunciation: /ˈmɪstə
 
/

noun

1A title used before a surname or full name to address or refer to a man without a higher or honorific or professional title: Mr Robert Smith
More example sentences
  • "It's much harder to get noticed now than it was 30 years ago," warns Mr. Rutherford.
  • Mr. Sunit Patel is joining Chaarat as Chief Geologist.
1.1Used before the name of an office to address a man who holds it: Mr President
More example sentences
  • Mr. Prime Minister, it appears that the Governor General has referred this matter to your office for further consideration.
  • Mr. Speaker, the Right Honourable Governor General desires the immediate attendance of this honourable House in the chamber of the honourable the Senate.
1.2(In the UK) used before a surname to address or refer to a male surgeon.
More example sentences
  • She received no medical aid till Saturday, when she was visited by the parish surgeon, Mr. Vaughan.
  • For laser eye surgery and general ophthalmology services, contact eye surgeon Mr C Steven Bailey in London, England.
1.3Used in the armed forces to address a senior warrant officer, officer cadet, or junior naval officer.
More example sentences
  • "I am your superior officer, Mister, and you will give me the respect I deserve!" Zarm angrily shot back to Wheeler.
  • "That was an order, Mister! Talk back to me again and I'll have you thrown in the brig for insubordination!"

Origin

late Middle English: originally an abbreviation of master1; compare with mister1.

Definition of Mr in:

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Word of the day flippant
Pronunciation: ˈflɪp(ə)nt
adjective
not showing a serious or respectful attitude

There are 2 definitions of Mr in English:

MR2

Line breaks: MR

abbreviation

Master of the Rolls.