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




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


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Alternative forms[edit]

  • (dextromethorphan) DXM



  1. (computing, DWH) Abbreviation of Dimensional modeling.
  2. (logic) 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) The Deutsche Mark, former German currency now replaced by the Euro.
    Note: DM was commonly used, but the official banking code was DEM.
  4. (nutrition) dry matter
  5. (organic chemistry) adamsite, diphenylaminechlorarsine
  6. (pharmacology) dextromethorphan
  7. (rail transport, in multiple unit formations) driving motor car
  8. (role-playing games) Dungeon Master
  9. (Britain) Daily Mail, a national newspaper
  10. (internet lingo) direct message (type of message on the Twitter microblogging platform)



DM (plural DMs)

  1. A direct message, usually on a social website.
    • 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.
  2. Initialism of duty manager.


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

  1. To Dungeon Master; to perform as a dungeon master; to run a tabletop role-playing game, especially Dungeons and Dragons.