Definition of: signor

(sēn′yôr) noun
1. An Anglicized form of the Italian title signore, used in respectful address to a gentleman: in society equivalent to the English sir when no name follows, to Mr. with a name, and to the French monsieur.
2. A lord or gentleman; especially, an Italian of rank, official position, or social distinction. Also si′gnior. [<Ital. signore <L senior senior]