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madam

 
 
/ˈmædəm/ noun formal

Definition

(also Madam) You call a woman 'madam' when you are speaking to her politely: This way, madam.
Madam You write 'Madam' at the beginning of a formal letter to a woman when you do not know her name: Dear Madam, I am writing to...
(Definition of madam noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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