Definition of mx:
(n) :
(philately) on early British stamps, Maltese Cross cancellation mark.
(n) :
(LGBTQ) A gender-neutral title used instead of Mr (Mister), Mrs (Mistress), etc.
(n) :
(motorcycling) Abbreviation of motocross. [(sports, motorcycling) A form of off-road motorbike racing.]
(n) :
(Internet) Abbreviation of mail exchanger.
(n) :
(military, US, historical, weaponry) Initialism of Missile, Experimental (original project name of the LGM-118 Peacekeeper ICBM).
(n) :
(medicine) Abbreviation of management. [(uncountable) Administration; the use of limited resources combined with forecasting, planning, leadership and execution skills to achieve predetermined specific goals.]