m. Married; Masculine; Meridiem=Noon; Metre.
M., Mons., Monsieur (Fr.). Mr or Sir;—MM., Messieurs, Gentlemen or Sirs.
M.A. Master of Arts. See A.M.
M.A.B.Y.S. Metropolitan Association for Befriending Young Servants.
Mac., Macc. Maccabees.
mach. Machinery.
Mad. Madam.
Mag. Magazine.
Maj. Major.
Mal. Malachi.