WordNet (r) 3.0 (2006):

mg
    n 1: one thousandth (1/1,000) gram [syn: milligram, mg]
    2: a light silver-white ductile bivalent metallic element; in
       pure form it burns with brilliant white flame; occurs
       naturally only in combination (as in magnesite and dolomite
       and carnallite and spinel and olivine) [syn: magnesium,
       Mg, atomic number 12]

The Free On-line Dictionary of Computing (30 December 2018):

mg

    The country code for Madagascar.

    MicroGnuEmacs.