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That is the correct spelling for "highness" (elevation, or a form of royal address).
Your Royal Highness or Imperial Highness It depends on the country and rank of the Princess because some princesses have the style "Highness" insetad of Royal or Imperial Highness.
Yes.
First time your Royal Highness, then after that, Madam.
'His Royal Highness The Prince of Wales', if your meeting the prince in person in the first instance you would address him as 'Your Royal Highness' and subsequently 'Sir'
In various ways: Your Royal Highness (eg in UK senior members of the royal family) Prince (eg in UK junior members of royalty.....after her divorce Dianna was NOT called Royal Highness) Serene Highness (eg Monaco, Liechtenstein) Imperial Highness (eg Japan)
"Your Royal Highness"
You would address a queen as "Your Majesty" or "Your Royal Highness".
Her Royal Highness or His Royal Highness.
First depending on your gender bow/curtsy, and call him, Your Royal Highness and after words Sir
Her Royal Highness The Princess Royal Buckingham Palace London SW1A 1AA
Mainly it depends on the country and its customs because some countries may not require a bow or curtsy to or addresing their members as a "Royal Highness" In most royal houses when you greet any member of the royal family you are to either bow or curtsy and address with their respected royal titles and styles The monarch and consort are to be addressed as "Your Majesty" The Princes' and Princesses are to be addressed with either "Your Royal Highness or Imperial Highness" and in some situations both After addressing the necessary titles you may (if told) address the person as "Sir" or "Ma'am"