MX

1. USabbreviationhistoricalinitialismengineeringInitialism of Missile, Experimental (original project name of the LGM-118 Peacekeeper ICBM).

plural MXs

1. InternetabbreviationcountableuncountableAbbreviation of mail exchanger.
2. abbreviationcountableuncountablehobbiesAbbreviation of motocross.
3. abbreviationcountableuncountablehobbiesAbbreviation of Maltese Cross, a cancellation mark appearing on early British stamps.

alternative Mx.

1. A gender-neutral title used instead of Mr (Mister), Mrs (Mistress), etc.

   Mx. Mirage. I am a radically queer trannyboi with a big mouth.

   2010, Sassafras Lowrey, editor, Kicked Out, page 216

   4 more examples

   It has been proposed that in addition to the honorific Mr. for male and Ms. for female, that the honorific Mx. be used for intersexuals […]

   2013, Heinz Duthel, Kathoey Ladyboy: Thailand’s Got Talent, Books on Demand, published 2013, →ISBN, page 84

   One of the most well-known gender nonconforming cabaret artists (who now works primarily in full length cabaret shows) is Mx Justin Vivian Bond.

   2014, Laura Erickson-Schroth, editor, Trans Bodies, Trans Selves, Oxford University Press, →ISBN, page 559

   “I think the thing that was most surprising was how supportive and gung-ho a lot older alums were,” said Mx. LoSchiavo, who graduated this year (and would have been admitted under the new policy, having identified as a female at the time of application).

   2015 June 4, Elizabeth A. Harris, “Barnard College, After Much Discussion, Decides to Accept Transgender Women”, in The New York Times

   In the new Notice, the Court is asking people to state their name, title (sometimes called "salutation"), and pronouns to be used in the proceeding, and for lawyers to provide this information for their clients. For example: "My name is Ms. Jane Lee, spelled L-E-E. I use she/her pronouns. I am the lawyer for Mx. Joe Carter who uses they/them pronouns." ("Mx." is pronounced like the word "mix" and is a gender-neutral title/salutation.)

   2020, Provincial Court of British Columbia, "A change in how parties and lawyers should introduce themselves in court," 16 December 2020

1. abbreviationuncountablemedicineAbbreviation of management.