Title

A title is a form of address appropriate to a particular person.

Examples:

• A person without a title is addressed as "my lord" or "my lady"
• A Lady as Lady
• A Lord as Lord
• A Knight is addressed as Sir
• A Count or Countess as Your Excellency
• A Duke or Duchess as Your Grace
• A Prince or Princess as Your Highness
• A King or Queen as Your Magesty

Note that these are the conventional english versions. Many people prefer titles more appropriate to their persona.