Royal Highness

noun

1. (in England)
   1. a title used prior to 1917 and designating a brother, sister, child, grandchild, aunt, or uncle belonging to the male line of the royal family.
   2. a title used since 1917 and designating a child or grandchild of the sovereign.
   3. any person given this title by the Crown.
2. (in other countries) a person who is a member of a royal family.

Royal Highness

noun

1. a title of honour used in addressing or referring to a member of a royal family

Word History and Origins

Origin of Royal Highness¹

First recorded in 1645–55