Wiktionary
highnesses
n. (plural of highnesse English)
Usage examples of "highnesses".
A bold attempt to assassinate Their Royal Highnesses the Prince and Princess of Wales within sight of Buckingham Palace was thwarted today by the courage of an American tourist.
Your wife also examined Their Royal Highnesses on the scene, and that was most useful to us.
But the security of Their Highnesses was properly the responsibility of the Yard, and he didn't like the fact that it was now largely in others' hands.
A few minutes after that, Their Highnesses were safely in the building, and for the moment the responsibility of someone else.