There are 3 main definitions of d in English:

d1

Syllabification: d

abbreviation

1.2Day(s): orbital period (Mars): 687.0d
1.4Deep.
1.5 [in combination] (In units of measurement) deci-.
1.7 (d.) Died (used to indicate a date of death): Barents, Willem (d.1597)
1.9British Penny or pence (of predecimal currency): £20 10s 6d
[from Latin denarius 'penny']
1.10 Chemistry Denoting electrons and orbitals possessing two units of angular momentum: d-electrons
[d from diffuse, originally applied to lines in atomic spectra]

symbol

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1 Mathematics Diameter.
1.1 Mathematics Denoting a small increment in a given variable: dy/dx

Definition of d in:

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There are 3 main definitions of d in English:

D2

Syllabification: D
(also d)

noun (plural Ds or D's)

1The fourth letter of the alphabet.
More 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 socioeconomic category for marketing purposes, including semiskilled and unskilled personnel.
2 (D) A shape like that of a capital D: [in combination]: the D-shaped handle
2.1A loop or ring shaped like that of a capital D.
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)]

Definition of d in:

There are 3 main definitions of d in English:

D3

Syllabification: D

abbreviation

1.1Depth (in the sense of the dimension of an object from front to back).
1.2 Chemistry Dextrorotatory: D-glucose
1.3(With a numeral) dimension(s) or dimensional: a 3-D model
1.4(In tables of sports results) drawn.
1.5(On an automatic gearshift) drive.

symbol

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

Definition of d in: