addressing women

[Betty Landers]

No: HPFGUIDX 21833

I've wondered this for years. What's the difference between Ms. and
Miss. And also in the HP books, some women (even professors) are called
Madam. (Madam Hooch, for example, and Madam Pomfrey is the nurse)
Others, on the other hand, are called Mrs. (Weasley, figg), and still
others are just called professor (McGonagall).  So what's the difference
in all these titles?  what makes someone go by a certain title?  Yes,
Mrs. means you're married, but what about the rest?  Did I make any
sense at all?

--
"Can't stay long, Mother," he said, "I'm up front, the prefects have got
two compartments to themselves--"
"Oh, are you a *Prefect, Percy?" said one of the twins with an air of
great surprise.  "You should have said something, we had no idea."
"Hang on, I think I remember him saying something about it," said the
other twin.  "Once--"
"Or twice--"
"a minute--"
"All summer--"
"Oh shut up," said Percy the Prefect.
Percy, Fred and George Weasley: Harry Potter and the Sorcerer's Stone,
Chapter Six.