There are 3 main definitions of d in English:

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d 1

Pronunciation: /diː/

abbreviation

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-.
5 (d.) Died (used to indicate a date of death): Barents, Willem (d.1597)
6British Penny or pence (of pre-decimal currency): £20 10s 6d
From Latin denarius 'penny'
7 Chemistry Denoting electrons and orbitals possessing two units of angular momentum: d-electrons
D from diffuse, originally applied to lines in atomic spectra

symbol

1 Mathematics Diameter: the circumference of a circle is expressed by the formula πd
2 Mathematics Denoting a small increment in a given variable: dy/dx
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There are 3 main definitions of d in English:

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D 2

Pronunciation: /diː/
(also d)

noun (plural Ds or D's)

1The fourth letter of the alphabet.
Example sentences
  • Each half resembles a uppercase letter D, so the two parts of the cyclotron are known as dees.
1.1Denoting the fourth in a set of items, categories, sizes, etc.
1.2The fourth-highest category of academic mark.
1.3 (d) Chess Denoting the fourth file from the left, as viewed from White’s side of the board.
1.4Denoting the second-lowest-earning socio-economic category for marketing purposes, including semi-skilled and unskilled personnel.
2 (D) (also dee) A shape like that of a capital D: [in combination]: the D-shaped handle
2.1A loop or ring in the shape of a capital D: a saddle with stainless steel dees
2.2 (D) A 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.
3 (usually D) Music The second note of the diatonic scale of C major.
3.1A key based on a scale with D as its keynote.
4The Roman numeral for 500.
Understood as half of CIƆ, an earlier form of M (= 1,000)
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There are 3 main definitions of d in English:

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D 3

Pronunciation: /diː/

abbreviation

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
3 Chemistry 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).
From German Deutschland

symbol

1 Physics Electric flux density.
2 Chemistry The hydrogen isotope deuterium.
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