n. An Italian lord or gentleman; specifically, a member of a class or body of ruling magistrates or senators in one of the old Italian republics.n. Hence A lord or gentleman in general; a man of aristocratic rank or associations.n. [capitalized] An Italian title of respect or address for a man, contracted from Signore before a name, equivalent to Señor in Spanish, Senhor in Portuguese, Monsieur or M. in French, Mister or Mr. in English, Herr in German, etc.