Mdse.—Merchandise.
M.E.—Mining, Military, Mechanical Engineer. Methodist Episcopal.
Me.—Maine.
Mem(o).—Memorandum or memoranda.
Messrs. or MM.—Messieurs, Gentlemen.
Mex.—Mexico.
Mfg.—Manufacturing.
Mfr.—Manufacturer.
Mgr.—Monsignor. Manager.
Mich.—Michigan.