royal highness

noun

1.

a. : a child, brother, sister, uncle, aunt, or grandchild in the male line of the British sovereign — used as a title before 1917

b. : a child or grandchild of the British sovereign — used as a title since 1917

c. : someone on whom the British sovereign chooses to bestow the designation

d. : any of various members of imperial and royal families of other countries

2. : a person properly addressed as Royal Highness

eight royal highnesses attended the coronation

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1. (in England)

a. 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.

b. a title used since 1917 and designating a child or grandchild of the sovereign.

c. any person given this title by the Crown.

2. (in other countries) a person who is a member of a royal family.

[1645-55]

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Royal Highness UK US noun

Phrases: Your Royal Highness ▪ ​Her Royal Highness ▪ ​His Royal Highness

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noun, pl ⋯ -nesses [count]

— used as a title for a member of a royal family;

— used with his, her, their, or your

their Royal Highnesses, the Prince and Princess of Wales

Her/His Royal Highness will receive you now.

Thank you, your Royal Highness.

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ˌRoyal ˈHighness [Royal Highness] noun His/Her/Your Royal Highness

a title of respect used when talking to or about a member of the royal family

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Their Royal Highnesses, the Duke and Duchess of Kent