1. A woman; a lady. A polite term of address. Abbreviation: Mdm. Plural: mesdames. ETYMOLOGY: Middle English borrowing from the French, ma dame , my lady, my beloved. In the Renaissance its meaning shifted referring to a keptmistress, a prostitute and later the manageress of a brothel.
2. Respectful and courteous form of address for a woman, especially if elderly or married, formerly used as a courtesy title before a woman's given name but now used mostly before a surname or title indicating rank or office. Madam Chairman. Madam President. Madam Ambassador.
(1) Mrs. Sally Adams (Ethel Merman), a Washington hostess later named ambassador to Lichtenburg, in Call Me Madam (1953): ' When you call me madam, smile.'
(2) Sung by Queenie (Raquel Welch) in The Wild Party (1975): ' Sally turned from Miss to Madam.'