Definition of highness in English:

highness

noun

  • 1His/Your" etc. "HighnessA title given to a person of royal rank, or used in addressing them:

    ‘I am most grateful, Your Highness’
    • ‘‘May I draw your attention, your Highness, to The Times,’ he said gravely.’
    • ‘Her Royal Highness, Sarah Ferguson, the Duchess of York, was an hour late.’
    • ‘‘Thank you, your Highness,’ Sarah whispered, sitting down again, blushing a deeper red.’
    • ‘His Royal Highness the Prince of Wales has been installed as an Honorary Freeman of the Company.’
    • ‘If I could have got close enough last week I would have thanked him personally, but His Highness was surrounded by photographers.’
    royal highness, highness, serene highness, serenity, magnificence
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  • 2[mass noun] The quality of being high:

    ‘the highness of her cheekbones’
    • ‘Her wide dark brown eyes and her thick coarse hair that she keeps styled in a professional bob accent the highness of her cheekbones.’
    highness, tallness, loftiness, distance upwards, extent upwards, vertical measurement, elevation, stature, altitude, distance above the ground
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Origin

Old English hēanes (see high, -ness).

Pronunciation:

highness

/ˈhʌɪnəs/