DD

Dictionary.com Unabridged

dd

1
Law. today's date.

Origin:
< Latin dē datō

dd

2
2.
delayed delivery.
4.
demand draft.
5.
double deck.
6.
Shipbuilding. dry dock.

dd.

delivered.

D/D

Commerce.
days after date.

D.D.

1.
demand draft.
2.
Doctor of Divinity.

D&D

Dungeons and Dragons.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
DD
 
abbreviation for
1.  Also: dd direct debit
2.  Doctor of Divinity

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

D.D.
1630, abbreviation of L. Divinitatis Doctor "Doctor of Divinity."
Online Etymology Dictionary, © 2010 Douglas Harper
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Slang Dictionary

dd

/dee-dee/ vt. [Unix: from IBM JCL] Equivalent to cat or BLT. Originally the name of a Unix copy command with special options suitable for block-oriented devices; it was often used in heavy-handed system maintenance, as in "Let's `dd' the root partition onto a tape, then use the boot PROM to load it back on to a new disk". The Unix `dd(1)' was designed with a weird, distinctly non-Unixy keyword option syntax reminiscent of IBM System/360 JCL (which had an elaborate DD `Dataset Definition' specification for I/O devices); though the command filled a need, the interface design was clearly a prank. The jargon usage is now very rare outside Unix sites and now nearly obsolete even there, as `dd(1)' has been deprecated for a long time (though it has no exact replacement). The term has been displaced by BLT or simple English `copy'.
FOLDOC
Computing Dictionary

DD definition


1. double density.
2. data dictionary.
3. Deployment Descriptor.
(2005-01-26)

dd definition


A Unix copy command with special options suitable for block-oriented devices; it was often used in heavy-handed system maintenance, as in "Let's "dd" the root partition onto a tape, then use the boot PROM to load it back on to a new disk".
dd had a distinctly non-Unixy keyword option syntax reminiscent of IBM System/360 JCL (which had an elaborate DD "Dataset Definition" specification for I/O devices). Though the command filled a need, the interface design was clearly a prank.
[Jargon File]
(2005-08-08)
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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American Heritage
Abbreviations & Acronyms
DD
  1. days after date

  2. developmental disability

  3. developmentally delayed

  4. dishonorable discharge

  5. Latin Divinitatis Doctor (Doctor of Divinity)

  6. double density

  7. dry-dock

  8. due date

  9. E.I. DuPont de Nemours & Co.

dd.
delivered
D.D.
demand draft
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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