There are 2 definitions of Mx in English:

Mx1

Syllabification: Mx

abbreviation

Maxwell(s).

Definition of Mx in:

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Word of the day flippant
Pronunciation: ˈflipənt
adjective
not showing a serious or respectful attitude

There are 2 definitions of Mx in English:

MX2

Syllabification: MX

abbreviation

Missile experimental (a US intercontinental ten-warhead ballistic missile).