Meaning of “Royal Highness” in the English Dictionary

british dictionary

"Royal Highness" in British English

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Royal Highnessnoun

uk /ˌrɔɪ.əl ˈhaɪ.nəs/ us /ˌrɔɪ.əl ˈhaɪ.nəs/
Her/His/Your Royal Highness

used when you are speaking about or to a royal person:

Thank you, Your Royal Highness.
His Royal Highness the Prince of Wales

(Definition of “Royal Highness” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)