1. Highness, aristocrat, blue blood, patrician

usage: (Your Highness or His Highness or Her Highness) title used to address a royal person

2. highness, loftiness, height, tallness

usage: the quality of being high or lofty

3. highness, degree, grade, level

usage: a high degree (of amount or force etc.); "responsible for the highness of the rates"

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See also: highness (Dictionary)