- (formal) A title of respect used to address a prince or princess.
- This is the second-person form of address to a prince or princess. Verbs used with this pronoun as the subject are conjugated in the third person. The forms used when referring in the third person are His Highness (to a man) and Her Highness (to a woman).
- If the prince or princess is a member of a royal family, the full form is Your Royal Highness; if a member of an imperial family (i.e., the family of an emperor or empress), the form is Your Imperial Highness.
- The corresponding form for a king, queen, emperor, or empress is Your Majesty.