Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • The symbol for the isotope deuterium.
  • The symbol for the Roman numeral 500.
  • abbreviation dative
  • abbreviation day
  • abbreviation defender
  • abbreviation defense
  • abbreviation defensive
  • abbreviation Democrat
  • abbreviation divorced
  • abbreviation down

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The fourth letter of the basic modern Latin alphabet.
  • noun mathematics cardinal number five hundred (500).
  • noun snooker The semicircle on the baulk line, inside which the cue ball must be placed at a break-off.
  • noun a grade awarded for a class, better than outright failure (which can be F or E depending on the institution) and worse than a C
  • noun chemistry Deuterium, when it needs to be distinguished from ordinary hydrogen.
  • noun computing Hexadecimal symbol for thirteen.
  • noun A standard size of dry cell battery larger than C.
  • noun Vehicle-distinguishing sign for Germany. (clarification of this Translingual definition is being sought)
  • noun biochemistry IUPAC one-letter abbreviation for aspartic acid.
  • noun mathematics The differential operator in calculus and analysis.
  • abbreviation Defense.
  • abbreviation US politics Democrat, especially preceding the constituent location.
  • abbreviation Divorced.
  • abbreviation Down (direction).
  • abbreviation Drive, the setting of an automatic transmission.
  • abbreviation printing Duodecimo, as adopted by the American Library Association.
  • abbreviation Dutch language.
  • abbreviation with “The” The City of Detroit.
  • noun The fourth letter of the English alphabet, called dee and written in the Latin script.
  • noun The ordinal number fourth, derived from this letter of the English alphabet, called dee and written in the Latin script.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Etruscan 𐌃 (D), from Greek Δ (D, "Delta"), from Phoenician 𐤃 (D, "dalet").

from Wiktionary, Creative Commons Attribution/Share-Alike License

A simplification of Ð under the graphic influence of the letter D, from a standardization of Ɔ superposed on a ⋌ or ⊢, from the practice of circling each hundredth ⋌ (now Roman numeral V), the tally stick notch mark representing five.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From the shape of the upper case letter "D"

from Wiktionary, Creative Commons Attribution/Share-Alike License

From the position (4) of the letter D in the English alphabet.

from Wiktionary, Creative Commons Attribution/Share-Alike License

Various abbreviations

Examples

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    January 2, 2010