For HM Da Q, I always call her "Your Maj'"
Its short for "Your Majesty"
The singular form would be majesty.
I dont think there is one.
Yes, the term "Your Majesty" is typically capitalized when used as a direct form of address to a monarch or ruler.
Her Majesty's Ship Beagle
The noun form (majesticness) is majesty, meaning greatness or dignity.
Your Majesty
Distinction does not have a short form. However, the short form of did not is didn't and the short form of are not is aren't.
William Proctor has written: 'A short journal of his Polish Majesty's camp of Radewitz'
Your Imperial Majesty is the generic form of address, but certain monarchies have specific titles.
Majesty: The Nothern Expansion and the Majesty 2 games
Hankie is the short form of handkerchief.