Noun highness has 2 senses
  1. Highness - (Your Highness or His Highness of Her Highness) title used to address a royal person
    --1 is a kind of
    aristocrat, blue blood, patrician
    --1 is a member of royalty, royal family, royal line, royal house
  2. highness, loftiness - the condition of being high or lofty
    --2 is a kind of height, tallness
    Antonyms: lowness
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