What is the difference between Mdm and Ms?

Mdm is an abbreviation of madam. The word in French is 'Madame', it is abbreviated to 'Mme'.

Madam used to be a common form of address for a married woman, but that was replaced by Mistress, which became abbreviated to Mrs. Madam is used these days as a title of respect, as in "Madam Chairman".

Ms. was coined in the 1950s as a convenience for writers - eliminating the R from the title Mrs, or IS from Miss would save typing time, and having one title for all women was seen as easier. Ms. is considered a compromised blend of Mrs and Miss. Many proponents of feminist thought adopted the term to ambiguate their marital status in the same way that Mr. does for a man.

The American Heritage Dictionary offers the following usage note for Ms.:

Usage Note: Many of us think of Ms. or Ms as a fairly recent invention of the women's movement, but in fact the term was first suggested as a convenience to writers of business letters by such publications as the Bulletin of the American Business Writing Association (1951) and The Simplified Letter, issued by the National Office Management Association (1952). Ms. is now widely used in both professional and social contexts. As a courtesy title Ms. serves exactly the same function that Mr. does for men, and like Mr. it may be used with a last name alone or with a full name. Furthermore, Ms. is correct regardless of a woman's marital status, thus relegating that information to the realm of private life, where many feel it belongs anyway. Some women prefer Miss or Mrs., however, and courtesy requires that their wishes be respected.

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RE:

What is the difference between Mdm and Ms?

I'm guessing Mdm is short for Madam, which I would take as equivalent to Mrs., which not only indicates a person is female but also specifies her marital status. Ms (no period because it's not an abbreviation of anything) is a term coined by the feminist movement as a means of indicating gender without specifying marital status (as is the case with Mr.).

Mdm is for Madame and Ms is for Miss. Madame is used to refer to a married or widowed lady, it's usually used by "used to be polite and courteous to the elderly. Miss is a very common term some people just use the word to be polite.

Madam and Ms.

Madam: Used as a form of polite address for a woman. 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.

Ms. : Used as a courtesy title before the surname or full name of a woman or girl:

mdm is Frans it means the ma ired women and ms is English

Madam is usually a married woman, miz is a feminist form used so as not to specify a married or unmarried state.