Main definitions of d in US English:

: d1D2D3


  • 1Date.

  • 2(in genealogies) daughter.

  • 3Day(s)

    ‘orbital period (Mars): 687.0d’
  • 4Deceased.

  • 5Deep.

  • 6in combination (in units of measurement) deci-.

  • 7(in travel timetables) departs.

  • 8"d."Died (used to indicate a date of death)

    ‘Barents, Willem (d.1597)’
  • 9Divorced.

  • 10British Penny or pence (of predecimal currency)

    ‘£20 10s 6d’
  • 11Chemistry
    Denoting electrons and orbitals possessing two units of angular momentum.


  • 1Diameter.

  • 2Denoting a small increment in a given variable.





Main definitions of d in US English:

: d1D2D3


  • 1Democrat or Democratic.

  • 2Depth (in the sense of the dimension of an object from front to back).

  • 3Chemistry

  • 4(with a numeral) dimension(s) or dimensional.

    ‘a 3-D model’
  • 5(in tables of sports results) drawn.

  • 6(on an automatic gearshift) drive.

  • 7(in personal ads) divorced.

  • 1Physics
    Electric flux density.

  • 2Chemistry
    The hydrogen isotope deuterium.




Main definitions of d in US English:

: d1D2D3


(also d)


  • 1The fourth letter of the alphabet.

    • ‘Each half resembles a uppercase letter D, so the two parts of the cyclotron are known as dees.’
    1. 1.1 Denoting the fourth in a set of items, categories, sizes, etc.
    2. 1.2 The fourth highest category of academic mark.
    3. 1.3"d"Chess Denoting the fourth file from the left, as viewed from White's side of the board.
    4. 1.4 Denoting the second-lowest-earning socioeconomic category for marketing purposes, including semiskilled and unskilled personnel.
  • 2A shape like that of a capital D.

    in combination ‘the D-shaped handle’
    1. 2.1 A loop or ring shaped like that of a capital D.
  • 3usually "D"Music
    The second note of the diatonic scale of C major.

    1. 3.1 A key based on a scale with D as its keynote.
  • 4The Roman numeral for 500.