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high·ness | \ ˈhī-nəs 
\
\Definition of highness
1 : the quality or state of being high
2 —used as a title for a person of exalted rank (such as a king or prince)
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highness
nounhigh·ness | \ ˈhī-nəs \
\Kids Definition of highness
1 : the quality or state or being high
highness of temperature
2 —used as a title for a person of very high rankHer Royal Highness, the Queen
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Time Traveler for highness
The first known use of highness was before the 12th century
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