Mr.

''Mister'', usually written in its contracted form ''Mr.'' or ''Mr'', is a commonly used English honorific for men without a higher honorific, or professional title, or any of various designations of office. The title ''Mr'' derived from earlier forms of ''master'', as the equivalent female titles ''Mrs'', ''Miss'', and ''Ms'' all derived from earlier forms of ''mistress''. ''Master'' is sometimes still used as an honorific for boys and young men.

The modern plural form is ''Misters'', although its usual formal abbreviation ''Messrs''(.) in English, and in French. The French, however, do not abbreviate ''messieurs'' as ''Messrs'' but as ''MM''. In India, one often finds ''messieurs'' abbreviated as ''M/S'' or ''M/s'', especially as a prefix to the name of a firm.}} derives from use of the French title ' in the 18th century. ' is the plural of ' (originally ', "my lord"), formed by declining both of its constituent parts separately. Provided by Wikipedia