highness
/ˈhaɪnɪs/noun
1
His/Your etc. Highness
a title given to a person of royal rank, or used in addressing them［对皇家成员的称呼］殿下, 阁下, 大人：I am most grateful, Your Highness.
我深表感激, 殿下。
2
- mass noun the state of being high高, 高度：
the highness of her cheekbones.
她颧骨之高。
词源
Old English hēanes （see HIGH, -NESS）.