Main definitions of d in English

: d1D2D3

d1

  • 1(in genealogies) daughter.

    ‘Henry m. Georgina 1957, 1s 2d’
  • 2Day(s)

    ‘orbital period (Mars): 687.0 d’
  • 3[in combination] (in units of measurement) deci-.

  • 4(in travel timetables) departs.

    ‘Plymouth d 0721’
  • 5Died (used to indicate a date of death)

    ‘Barents, Willem (d.1597)’
  • 6British Penny or pence (of pre-decimal currency)

    ‘£20 10s 6d’
  • 7Chemistry
    Denoting electrons and orbitals possessing two units of angular momentum.

    ‘d-electrons’

Mathematics
  • 1Diameter.

    ‘the circumference of a circle is expressed by the formula πd’
  • 2Denoting a small increment in a given variable.

    ‘dy/dx’

Pronunciation:

d

/diː/

Main definitions of d in English

: d1D2D3

D2

(also d)

noun

  • 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. 1.1Denoting the fourth in a set of items, categories, sizes, etc.
    2. 1.2The fourth-highest category of academic mark.
    3. 1.3Chess
      Denoting the fourth file from the left, as viewed from White's side of the board.
    4. 1.4Denoting the second-lowest-earning socio-economic category for marketing purposes, including semi-skilled and unskilled personnel.
  • 2A shape like that of a capital D.

    [in combination] ‘the D-shaped handle’
    1. 2.1A loop or ring in the shape of a capital D.
      ‘a saddle with stainless steel dees’
    2. 2.2A semicircle marked on a billiard table in the baulk area, with its diameter part of the baulk line, within which a player must place the cue ball when breaking off or restarting from hand.
  • 3Music
    The second note of the diatonic scale of C major.

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

Pronunciation:

D

/diː/

Main definitions of d in English

: d1D2D3

D3

  • 1(in the US) Democrat or Democratic.

    ‘Delaware: breakdown of outgoing Senate: 13 D, 8 R’
  • 2Depth (in the sense of the dimension of an object from front to back)

    ‘H 35 cm × W 50 cm × D 20 cm’
  • 3Chemistry
    Dextrorotatory.

    ‘D-glucose’
  • 4(with a numeral) dimension(s) or dimensional.

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

  • 6(on an automatic gear shift) drive.

  • 7Germany (international vehicle registration).

  • 1Physics
    Electric flux density.

  • 2Chemistry
    The hydrogen isotope deuterium.

Pronunciation:

D

/diː/