abbr.Mdm.1. Inflected forms: pl. Mes·dames (m-dm, -däm) Used formerly as a courtesy title before a woman's given name but now used only before a surname or title indicating rank or office: Madam Ambassador.2. Used as a salutation in a letter: Dear Madam or Sir.3.madam Used as a form of polite address for a woman: Right this way, madam.4.madam The mistress of a household. 5.madam A woman who manages a brothel. See Usage Note at mistress.
ETYMOLOGY:
Middle English madame, from Old French ma dame. See Madame.
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