There are 3 definitions of d in English:

d1

Line breaks: d
Pronunciation: /diː
 
/

abbreviation

1(In genealogies) daughter: Henry m. Georgina 1957, 1s 2d
1.1Day(s): orbital period (Mars): 687.0 d
1.2 [in combination] (In units of measurement) deci-.
1.3(In travel timetables) departs: Plymouth d 0721
1.4 (d.) Died (used to indicate a date of death): Barents, Willem (d.1597)
1.5British Penny or pence (of pre-decimal currency): £20 10s 6d
[from Latin denarius 'penny']
1.6 Chemistry Denoting electrons and orbitals possessing two units of angular momentum: d-electrons
[d from diffuse, originally applied to lines in atomic spectra]

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1 Mathematics Diameter: the circumference of a circle is expressed by the formula πd
1.1 Mathematics Denoting a small increment in a given variable: dy/dx

Definition of d in:

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Word of the day apposite
Pronunciation: ˈapəzit
adjective
apt in the circumstances or relation to something

There are 3 definitions of d in English:

D2

Line breaks: D
Pronunciation: /diː
 
/
(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 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)]

Definition of d in:

There are 3 definitions of d in English:

D3

Line breaks: D
Pronunciation: /diː
 
/

abbreviation

1(In the US) Democrat or Democratic: Delaware: breakdown of outgoing Senate: 13 D, 8 R
1.1Depth (in the sense of the dimension of an object from front to back): H 35 cm × W 50 cm × D 20 cm
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 gear shift) drive.
1.6Germany (international vehicle registration).
[from German Deutschland]

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

Definition of d in: