名詞 highness:

1. (Your Highness or His Highness or Her Highness) title used to address a royal person
2. the condition of being high or lofty
   同義詞：loftiness
3. a high degree (of amount or force etc.)

1. Ladies and gentlemen, I give you his Royal Highness, the Prince of Wales.
   女士們，先生們，請為威爾士親王殿下乾杯。
2. His Highness Prince Charles will attend the meeting.
   查爾斯親王殿下將出席本次會議。

high.ness

n.（名詞）
The quality or condition of being high.
高，高度：高的性質(zhì)或狀態(tài)
Highness Used withHis, Her, or Your as a title and form of address for a prince or princess:
Highness 與His,Her 或 Your 連用，用來稱呼王子（親王）或公主（王妃）：
例句：
Her Royal Highness the Princess Margaret.
瑪格麗特公主殿下