From BiblePortal Wikipedia

King James Dictionary [1]

Highness, n. hi'ness. Elevation above the surface loftiness altitude highth.

1. Dignity elevation in rank, character or power. 2. Excellence value. 3. Violence as the highness of wind. 4. Great amount as the highness of price. 5. Acuteness as the highness of a note or voice. 6. Intenseness, as of heat. 7. A title of honor given to princes or other men of rank.

Webster's Dictionary [2]

(1): ( n.) A title of honor given to kings, princes, or other persons of rank; as, His Royal Highness.

(2): ( n.) The state of being high; elevation; loftiness.