D defs.my
Entry 2 senses Webster, 1913

Highness

· High·ness · IPA /ˈhaɪnəs/
01 n. The state of being high; elevation; loftiness.
  1. 1.
    The state of being high; elevation; loftiness.
  2. 2.
    A title of honor given to kings, princes, or other persons of rank; as, His Royal Highness.