Etymology
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highness (n.)

Old English heanes; see high (adj.) + -ness. Meaning "royalty, excellence, nobility" is early 13c.; Your Highness as a form of address to English royalty is attested from c. 1400.

updated on September 09, 2012

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Definitions of highness from WordNet
1
highness (n.)
the quality of being high or lofty;
Synonyms: loftiness
highness (n.)
a high degree (of amount or force etc.);
responsible for the highness of the rates
2
Highness (n.)
(Your Highness or His Highness or Her Highness) title used to address a royal person;
From wordnet.princeton.edu, not affiliated with etymonline.