Mister

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Used as a courtesy title before the surname, full name, or professional title of a man, usually written in its abbreviated form: Mr. Jones; Mr. Secretary.
2. n. Used as the official term of address for certain U.S. military personnel, such as warrant officers.
3. n. Informal Used as a form of address for a man: Watch your step, mister.
4. n. Informal Used as a term of reference by a woman of her husband.

Century Dictionary and Cyclopedia

1. n. Master: a word which has lost its real meaning, and become a mere conventional title: nearly always written in the abbreviated form Mr. Prefixed to the name of a gentleman, or now, by extension, to that of any man, as a conventional title of address or mention. [The abbreviation Mr. (also M.), as found in books of the sixteenth century and for some time later, is to be read Master. (Compare master, n., 7.) Mister is simply a weaker form of Master.]
2. n. Prefixed to the official designation of certain officers or dignitaries in formal address, as Mr. President, Mr. Secretary, Mr. Speaker, Mr. Chairman, Mr. Clerk.
3. n. Sir: used alone, in address, when the man's name is not known: as, mister, you've dropped your gloves; have a paper, mister?
4. n. Trade; mechanical occupation; craft.
5. n. Condition in life; fortune.
6. n. Manner; kind; sort.
7. n. Need; necessity; anything necessary.
8. To occasion loss to.
9. To need; require.
10. To be in necessitous circumstances.
11. To be necessary or indispensable.

Wiktionary

1. n. General title or respect of an adult male.
2. n. Official title of a military man, usually anyone below rank of captain.
3. n. Official form of address of a president of a nation; Mister President.
4. n. A warrant officer or cadet in the United States Military Academy at West Point.
5. n. An informal title used before a nickname or other moniker:

GNU Webster's 1913

1. n. A title of courtesy prefixed to the name of a man or youth. It is usually written in the abbreviated form Mr.
2. v. colloq. To address or mention by the title Mr..
3. n. obsolete A trade, art, or occupation.
4. n. obsolete Manner; kind; sort.
5. n. obsolete Need; necessity.
6. v. obsolete To be needful or of use.

WordNet 3.0

1. n. a form of address for a man