Definition from Wiktionary, the free dictionary See also
highness A translation of the Italian altezza Highness (plural
Highnesses) - The style of a prince, princess or someone of
equivalent rank. - (obsolete) The style of an emperor or king. -
(both senses): The style is typically used with a possessive
pronoun: Your Highness, Their Highnesses, et al. - (obsolete:
style of emperor or king): Majesty (current)