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See also: .dm, D.M., Dm, d.m., and dm




  1. The ISO 3166-1 two-letter (alpha-2) code for Dominica.


English Wikipedia has articles on:


DM (countable and uncountable, plural DMs)

  1. (computing, DWH) Initialism of dimensional modeling.
  2. (logic) Initialism of De Morgan’s law.
    • 2004 August, J. L. Schellenberg, “The Atheist’s Free Will Offence” in the International Journal for Philosophy of Religion, volume 56, № 1, pages 11–12
      Let ‘F’ stand for the state of affairs that consists in finite persons possessing and exercising free will. Let ‘p’ stand for ‘God exists’; ‘q’ for ‘F obtains’; ‘r’ for ‘F poses a serious risk of evil’; and ‘s’ for ‘There is no option available to God that counters F.’ With this in place, the argument may be formalized as follows:
      (1) [(p & q) & r] → s Premiss
      (2) ~s        Premiss
      (3) ~[(p & q) & r]   1, 2 MT
      (4) ~(p & q) v ~r    3 DM
      (5) r         Premiss
      (6) ~(p & q)      4, 5 DS
      (7) ~p v ~q      6 DM
      (3) follows from the conjunction of (1) and (2) by modus tollens; De Morgan’s law applied to (3) yields (4); (4) and (5) together lead to (6) by disjunctive syllogism; and another application of De Morgan’s law takes us from (6) to the final conclusion, according to which either God exists or there is free will (but not both).
  3. (money) Initialism of Deutsche Mark.
    Synonym: (official banking code) DEM
  4. (nutrition) Initialism of dry matter.
  5. (medicine) Initialism of diabetes mellitus.
  6. (organic chemistry) adamsite, diphenylaminechlorarsine
  7. (pharmacology) Abbreviation of dextromethorphan; also DXM.
  8. (rail transport, in multiple unit formations) driving motor car
  9. (role-playing games) Initialism of dungeon master.
    Synonyms: GM, ST
  10. (Internet) Initialism of direct message (type of message on social media platforms).
    • 2012, Scott Stratten, Alison Kramer, UnMarketing: Stop Marketing. Start Engaging
      He later sent me a DM mentioning that he would send me what he wears because he does a lot of walking. This is where the relationships online can get a wee bit weird.
    Coordinate terms: PM, IM
  11. Initialism of duty manager.
  12. (philosophy) Initialism of dialectical materialism.
  13. (BDSM) Initialism of dungeon monitor.


DM (third-person singular simple present DMs, present participle DMing, simple past and past participle DMed or DM'd)

  1. To Dungeon Master; to perform as a dungeon master; to run a tabletop role-playing game, especially Dungeons and Dragons.
    Synonym: GM
  2. To communicate by direct message, usually on a social website.
    • 2021 August 2, quoting Tyrone Mings, “Tyrone Mings Opens Up over Mental Health Struggles ahead of Euro 2020”, in Yahoo! Sports[1], archived from the original on 4 August 2021:
      Rio [Ferdinand] DM’d me after the tournament. He’d said I was the weak link, and that Croatia should be targeting me.

Proper noun[edit]


  1. (UK) Initialism of Daily Mail. (a national newspaper)




  • IPA(key): /deːˈʔɛm/
  • (file)


DM f (genitive DM, no plural)

  1. (money, historical) Initialism of Deutsche Mark.
    Coordinate term: M