Webster's English Dictionary

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madam

mad.am \'mad-*m\ \ma--'da:m, -'dam\ n or madams;  or mes.dames [ME, fr. OF 
   ma dame, lit., my lady] pl  pl  1: LADY - used without a name as a form of 
   respectful or polite add ress to a woman 2: MISTRESS - used as title 
   formerly with the given name but now wi th the surname as an equivalent of 
   Madame or esp. with a designation of rank or office {Madam Chairman} {Madam 
   President} 3: the female head of a house of prostitution  4: the female 
   head of a household : WIFE