mad ‧ am S3 /ˈmædəm/ BrE AmE noun
[ Date: 1200-1300 ; Language: Old French ; Origin: ma dame 'my lady' ]
1 . formal used to address a woman in a polite way, especially a customer in a shop SYN ma'am American English :
Are you being served, Madam?
2 . Dear Madam formal used at the beginning of a business letter to a woman, when you do not know her name
3 . Madam President/Ambassador etc used to address a woman who has an important official position
4 . [countable] a woman who is in charge of a ↑ brothel
5 . a (proper) little madam British English informal a young girl who is very confident and who expects other people to do everything she wants