señor

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 in a Spanish-speaking area.
2. n. Used as a form of polite address for a man in a Spanish-speaking area.
3. n. A Spanish or Spanish-speaking man.

Century Dictionary and Cyclopedia

1. n. A gentleman; in address, sir; as a title, Mr.: in Spanish use.

GNU Webster's 1913

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

WordNet 3.0

1. n. a Spanish title or form of address for a man; similar to the English `Mr' or `sir'