Etymology
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MS.

abbreviation of Latin manu scriptum (see manuscript); the plural is MSS, after the custom in Modern Latin.

Ms.

(plural Mses.), in modern continuous use from about 1949, considered a blend of Miss and Mrs. The abbreviation had appeared or been suggested before in this sense, since at least c. 1900.

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Definitions of MS.

Ms. (n.)
a form of address for a woman;
Synonyms: Ms
From wordnet.princeton.edu