noun (n)

• (Your Highness or His Highness or Her Highness) title used to address a royal person(noun.person)

  source: wordnet30
• the quality of being high or lofty(noun.attribute)

  Synonym:
  loftiness
  Antonym:
  lowness
  

  source: wordnet30
• a high degree (of amount or force etc.)(noun.attribute)

  Example:
  Responsible for the highness of the rates.
  

  source: wordnet30
• The state of being high; elevation; loftiness.(noun)

  source: webster1913