Originally posted by: Yomicron
Acording to the
Merriam-Webster dictionary,
miss:
1 capitalized a -- used as a title prefixed to the name of an unmarried woman or girl b -- used before the name of a place or of a line of activity or before some epithet to form a title for a usually young unmarried female who is representative of the thing indicated <Miss America>
2 : young lady -- used without a name as a conventional term of address to a young woman
3 : a young unmarried woman or girl
Mrs:
1 a -- used as a conventional title of courtesy except when usage requires the substitution of a title of rank or an honorific or professional title before a married woman's surname <spoke to Mrs. Doe> b -- used before the name of a place (as a country or city) or of a profession or activity (as a sport) or before some epithet (as clever) to form a title applied to a married woman viewed or recognized as representative of the thing indicated <Mrs. Golf>
2 : WIFE <took the Mrs. to dinner>
Ms:
-- used instead of Miss or Mrs. (as when the marital status of a woman is unknown or irrelevant) <Ms. Mary Smith>