Etymology
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madame

formal term of address to a lady, 1590s, see madam, which is an earlier borrowing of the same French phrase. Originally a title of respect for a woman of rank, now given to any married woman. It is more formal or affected than madam. OED recommends madam as an English title, madame in reference to foreign women.

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Definitions of madame

madame (n.)
title used for a married Frenchwoman;
From wordnet.princeton.edu