1. An Italian title of address equal to our Mr. See Seignior.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• sennior,
• signer,
• aignior,
• zignior,
• xignior,
• dignior,
• wignior,
• sugnior,
• sjgnior,
• skgnior,
• sognior,
• s9gnior,
• s8gnior,
• sifnior,
• sivnior,
• signor,
• signioz,
• signios,
• siggnor,
• sineor

• signorile,
• signorina,
• seignior,
• sisneros,
• sisemore,
• signora,
• signory,
• seigniory,
• signorelli,
• signor,
• Sizemore,
• signer,
• signore.

The adjective form of the word "signior" is "signorial".