- 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.
- a title used since 1917 and designating a child or grandchild of the sovereign.
- any person given this title by the Crown.
(in other countries) a person who is a member of a royal family.
Origin of Royal Highness
First recorded in 1645–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for royal highness
a title of honour used in addressing or referring to a member of a royal family
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012