( initial capital letter ) a conventional title of respect for a man, prefixed to the name and to certain official designations (usually written as the abbreviation Mr. ).

Informal . sir (used in direct address and not followed by the name of the man addressed)

Mister, is this your umbrella?

( initial capital letter ) a title prefixed to a mock surname that is used to represent possession of a particular attribute, identity, etc.

Mister Know-it-all.

the informal or social title used in addressing a military warrant officer or any naval officer below the rank of commander.

(esp. in military schools and colleges)

a term of respect used by cadets in addressing upperclassmen

used with surname.

a term of disparagement used by upperclassmen in addressing cadets

Mister, tuck in that shirttail!

Older Use . husband

You and the mister staying long?

to address or speak of as mister or Mr.