señor

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Used as a courtesy title before the surname, full name, or professional title of a man in a Spanish-speaking area.
• noun Used as a form of polite address for a man in a Spanish-speaking area.
• noun A Spanish or Spanish-speaking man.

from The Century Dictionary.

• noun A gentleman; in address, sir; as a title, Mr.: in Spanish use.

from the GNU version of the Collaborative International Dictionary of English.

• noun A Spanish title of courtesy corresponding to the English Mr. or Sir; also, a gentleman.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a Spanish title or form of address for a man; similar to the English `Mr' or `sir'