Many of us think of Ms. or Ms as a very recent invention of the womens 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). Along with many others, champions of womens rights saw the virtues of the term and soon advocated its use in more general contexts, as is evidenced by the founding of Ms. magazine in 1972.
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The form Ms. or Ms is now widely used in both professional and social contexts. Thus the term stands as a highly successful language reformprobably because people value its usefulness. As a courtesy title, Ms. serves exactly the same function as Mr. does for men, and like Mr. it may be used with a last name alone or with a full name: Ms. Pemberton; Ms. Miriam E. Pemberton.
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Using Ms. obviates the need for the guesswork involved in figuring out whether to address someone as Mrs. or Miss: you cant go wrong with Ms. Whether the woman you are addressing is married or unmarried, has changed her name or not, Ms. is always correct. And the beauty of Ms. is that this information becomes irrelevant, as it should beand as it has always been for men.
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Of course, some women may indicate that they prefer to use the title Miss or Mrs., and in these cases it only makes sense to follow their wishes.