as an abbreviation, stands for Manlius, Marcus, Martius, and Mucius; M.A. signifies magister artium, or master of arts; MS. manuscript, and MSS. manuscripts.

M, in astronomical tables, and other things of that kind, is used for meridional or southern; and sometimes for meridian or mid-day.

M, in medicinal prescription, is frequently used to signify a manipule or handful; and it is sometimes also put at the end of a recipe, for mixte "mingle;" or for mixtura "a mixture." Thus, m.f. julapium, signifies "mix and make a julep."

M, in law, the brand or stigma of a person convicted of manslaughter, and admitted to the benefit of his clergy. It is to be burnt on the brow of his left thumb.