Definitions:
the fourth letter of the alphabet.

a shape like that of a capital d

the second note of the diatonic scale of c major.

the roman numeral for 500.

(in the us) democrat or democratic

depth (in the sense of the dimension of an object from front to back)

dextrorotatory

(with a numeral) dimension(s) or dimensional

(in tables of sports results) drawn.

(on an automatic gear shift) drive.

germany (international vehicle registration).

electric flux density.

the hydrogen isotope deuterium.

(in genealogies) daughter

day(s)

(in units of measurement) deci-.

(in travel timetables) departs

died (used to indicate a date of death)

penny or pence (of pre-decimal currency)

denoting electrons and orbitals possessing two units of angular momentum

diameter

denoting a small increment in a given variable