a woman of refinement
"a chauffeur opened the door of the limousine for the grand lady"
a woman who runs a house of prostitution
"The detective approached the dimly lit bar, knowing that the wealthy madam inside would be eager to negotiate for her newest client's silence."
A polite form of address for a woman or lady.
"When signing her name on the invitation, she carefully wrote out MADAM in all capital letters to match the formal theme."
Alternative letter-case form of madam
To address as "madam".
"When I entered the boutique, the sales associate politely greeted me by saying, "Good morning, madam.""