'd
contraction of had:I was glad they'd gone.
contraction of did:Where'd they go?
contraction of should or would:He'd like to go. I'd like to remind you of your promise.
contraction of -ed:She OK'd the plan.
Other definitions for d' (2 of 12)
de (used in French names as an elided form of de): Charles Louis d'Albert.
di (used in Italian names as an elided form of di): Gabriele d'Annunzio.
Other definitions for d' (3 of 12)
Informal. contraction of do or did before you:How d'you like your eggs cooked? D'you go to the movies last night?
Other definitions for D (4 of 12)
or d
the fourth letter of the English alphabet, a consonant.
any spoken sound represented by the letter D or d, as in dog, ladder, ladle, or pulled.
something having the shape of a D.
a written or printed representation of the letter D or d.
a device, as a printer's type, for reproducing the letter D or d.
Other definitions for D (5 of 12)
Other definitions for D (6 of 12)
the fourth in order or in a series.
(sometimes lowercase) (in some grading systems) a grade or mark, as in school or college, indicating the quality of a student's work as poor or barely passing.
(sometimes lowercase) a classification, rating, or the like, indicating poor quality.
Music.
the second tone in the scale of C major, or the fourth tone in the relative minor scale, A minor.
a string, key, or pipe tuned to this tone.
a written or printed note representing this tone.
(in the fixed system of solmization) the second tone of the scale of C major, called re.
the tonality having D as the tonic note.
(sometimes lowercase) the Roman numeral for 500.: Compare Roman numerals.
Chemistry. deuterium. : Also 2H
Electricity.
electric displacement.
a battery size for 1.5 volt dry cells: diameter, 1.3 inches (3.3 centimeters); length, 2.4 inches (6 centimeters).
Biochemistry. aspartic acid.
a symbol for a shoe width size narrower than E and wider than C.
a proportional brassiere cup size larger than C.
Other definitions for d- (7 of 12)
dextrorotatory; dextro- (distinguished from l-).
- Compare D-.
Other definitions for D- (8 of 12)
Symbol, Biochemistry. (of a molecule) having a configuration resembling the dextrorotatory isomer of glyceraldehyde: always printed as a small capital, roman character.
- Compare d-.
Other definitions for d. (9 of 12)
(in prescriptions) give.
Origin of d.
9Other definitions for d. (10 of 12)
British. pence.
Origin of d.
10Other definitions for d. (11 of 12)
date.
daughter.
day.
deceased.
deep.
degree.
delete.
Physics. density.
depth.
deputy.
dialect.
dialectal.
diameter.
died.
dime.
dividend.
dollar; dollars.
dose.
drachma.
Other definitions for D. (12 of 12)
day.
December.
Democrat.
Democratic.
Physics. density.
Deus.
Deuteronomy.
Doctor.
dose.
Dutch.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
British Dictionary definitions for d (1 of 7)
D
/ (diː) /
the fourth letter and third consonant of the modern English alphabet
a speech sound represented by this letter, usually a voiced alveolar stop, as in dagger
the semicircle on a billiards table having a radius of 11 1/2 inches and its straight edge in the middle of the baulk line
British Dictionary definitions for d (2 of 7)
physics density or relative density
maths a small increment in a given variable or function: used to indicate a derivative of one variable with respect to another, as in d y /d x
chess See algebraic notation
British Dictionary definitions for 'd (3 of 7)
would or had: I'd; you'd
British Dictionary definitions for D (4 of 7)
Deutsch: indicating the serial number in the catalogue (1951) of the musical compositions of Schubert made by Otto Deutsch (1883–1967)
British Dictionary definitions for D (5 of 7)
music
a note having a frequency of 293.66 hertz (D above middle C) or this value multiplied or divided by any power of 2; the second note of the scale of C major
a key, string, or pipe producing this note
the major or minor key having this note as its tonic
chem deuterium
maths the first derivative of a function, as in D(x ³ + x ²) = 3 x ² + 2 x
physics
dispersion
electric displacement
aeronautics drag
a semiskilled or unskilled manual worker, or a trainee or apprentice to a skilled worker
(as modifier): D worker See also occupation groupings
(Roman numeral) 500: See Roman numerals
Germany (international car registration)
Australian informal defence: I'm playing D in the match this afternoon
Australian informal defensive play
Origin of D
5British Dictionary definitions for d. (6 of 7)
(in animal pedigrees) dam
daughter
British currency penny or pennies
diameter
died
dinar(s)
dollar(s)
drachma(s)
Origin of d.
6British Dictionary definitions for D. (7 of 7)
US politics Democrat(ic)
government Department
dinar(s)
Don (a Spanish title)
Duchess
Duke
(in the US and Canada) Doctor
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for d
Abbreviation of diameter
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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