'Highness' definitions:

Definition of 'Highness'

(from WordNet)
noun
(Your Highness or His Highness or Her Highness) title used to address a royal person
noun
The quality of being high or lofty [syn: highness, loftiness] [ant: lowness]
noun
A high degree (of amount or force etc.); "responsible for the highness of the rates"

Definition of 'Highness'

From: GCIDE
  • Highness \High"ness\, n. [AS. he['a]hnes.]
  • 1. The state of being high; elevation; loftiness. [1913 Webster]
  • 2. A title of honor given to kings, princes, or other persons of rank; as, His Royal Highness. --Shak. [1913 Webster]

Synonyms of 'Highness'

From: Moby Thesaurus

Words containing 'Highness'