Definify.com
Webster 1913 Edition
Madam
1.
A gentlewoman; – an appellation or courteous form of address given to a lady, especially an elderly or a married lady; – much used in the address, at the beginning of a letter, to a woman. The corresponding word in addressing a man is
Sir
; often abbreviated ma’am
when used as a term of address. Webster 1828 Edition
Madam
MAD'AM
,Noun.