Bedeutung von “madam” — Learner’s Dictionary

madam

noun us uk /ˈmædəm/ formal

B1 also Madam You call a woman 'madam' when you are speaking to her politely:

This way, madam.
Madam

B2 You write 'Madam' at the beginning of a formal letter to a woman when you do not know her name:

Dear Madam, I am writing to...

(Definition von “madam” aus dem Cambridge Learner's Dictionary © Cambridge University Press)