The Collaborative International Dictionary of English v.0.48:

Mx \Mx\ prop. n.
   The symbol for the maxwell, a cgs unit of magnetic flux.

   Syn: maxwell.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Mx
    n 1: a cgs unit of magnetic flux equal to the flux perpendicular
         to an area of 1 square centimeter in a magnetic field of 1
         gauss [syn: maxwell, Mx]

V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

MX
       Mail eXchange (Unix)


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

Mail Exchange Record
MX
MX Record

    (MX Record) A DNS resource record type that says
   which SMTP server handles electronic mail for a particular
   domain.  E.g. the MX record

    foo.co.uk. 1054 IN MX 10 mail.foo.co.uk.

   means that mail for an address like "denis@foo.co.uk" should
   be sent to "mail.foo.co.uk".

   There can be several servers for a domain.  The "10" is a
   priority - the server with the lowest number will be tried
   first.

   (2007-01-29)


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

mx

    The country code for Mexico.

   (1999-01-27)