mTranslate m | into French | into German | into Italian | into Spanish Definition of m abbreviation mare. married: m twice; two d masculine. (m-) [in combination] Chemistry meta-:m-xylene metre(s). mile(s). [in combination] (in units of measurement) milli-:the generator operated at 40 kV and 100 mA million(s):£5 m minute(s). symbol Physics mass:E = mc2m in other Oxford dictionaries Definition of m in the US English dictionary