Noah Webster
Highness
HIGHNESS, noun 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.
HIGHTH
HIGHT, noun [See Height.] Elevation; altitude; loftiness. [It is very desirable that this noun should be regularly formed from the adjective.]
Hight, to call, to promise, to command, etc., is a false orthography, from Saxon, hatan. It is obsolete. [See Heat.]