D

¹

abbreviation

1. Electricity.,  debye; debyes.

2. deep.

3. depth.

4. Optics.,  diopter.

5. divorced.

6. Dutch.

'd

²

1. contraction of had:

   I was glad they'd gone.

2. contraction of did:

   Where'd they go?

3. contraction of should or would:

   He'd like to go. I'd like to remind you of your promise.

4. contraction of -ed:

   She OK'd the plan.

D.

³

abbreviation

1. day.

2. December.

3. Democrat.

4. Democratic.

5. Physics.,  density.

6. Deus.

7. Deuteronomy.

8. Doctor.

9. dose.

10. Dutch.

D

⁴

Or d

[dee]

noun

plural

D's, Ds, d's, ds. 

1. the fourth letter of the English alphabet, a consonant.

2. any spoken sound represented by the letter D or d, as in dog, ladder, ladle, or pulled.

3. something having the shape of a D .

4. a written or printed representation of the letter D or d.

5. a device, as a printer's type, for reproducing the letter D or d.

d.

⁵

abbreviation

1. British.,  pence.

d.

⁶

abbreviation

1. (in prescriptions) give.

d'

⁷

1. Informal.,  contraction of do or did before you:

   How d'you like your eggs cooked? D'you go to the movies last night?

D

⁸

Symbol.

1. the fourth in order or in a series.

2. (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.

3. (sometimes lowercase),  a classification, rating, or the like, indicating poor quality.

4. Music.

   1. the second tone in the scale of C major, or the fourth tone in the relative minor scale, A minor.

   2. a string, key, or pipe tuned to this tone.

   3. a written or printed note representing this tone.

   4. (in the fixed system of solmization) the second tone of the scale of C major, called re.

   5. the tonality having D as the tonic note.

5. (sometimes lowercase),  the Roman numeral for 500.

6. Chemistry.,  deuterium. Also 2H

7. Electricity.

   1. electric displacement.

   2. a battery size for 1.5 volt dry cells: diameter, 1.3 inches (3.3 centimeters); length, 2.4 inches (6 centimeters).

8. Biochemistry.,  aspartic acid.

9. a symbol for a shoe width size narrower than E and wider than C.

10. a proportional brassiere cup size larger than C.

d-

⁹

Symbol, Chemistry, Biochemistry.

1. dextrorotatory; dextro- (l- ).

d.

¹⁰

abbreviation

1. date.

2. daughter.

3. day.

4. deceased.

5. deep.

6. degree.

7. delete.

8. Physics.,  density.

9. depth.

10. deputy.

11. dialect.

12. dialectal.

13. diameter.

14. died.

15. dime.

16. dividend.

17. dollar; dollars.

18. dose.

19. drachma.

D-

¹¹

1. Symbol, Biochemistry.,  (of a molecule) having a configuration resembling the dextrorotatory isomer of glyceraldehyde: always printed as a small capital, roman character.

d'

¹²

preposition

1. de (used in French names as an elided form ofde ).

   Charles Louis d'Albert.

2. di (used in Italian names as an elided form ofdi ).

   Gabriele d'Annunzio.

'd

¹

contraction

1. would or had

   I'd

   you'd

d

²

symbol

1. physics density or relative density

2. 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

3. chess See algebraic notation

d.

³

abbreviation

1. (in animal pedigrees) dam

2. daughter

3. currency penny or pennies

4. diameter

5. died

6. dinar(s)

7. dollar(s)

8. drachma(s)

D.

⁴

abbreviation

1. politics Democrat(ic)

2. government Department

3. dinar(s)

4. Don (a Spanish title)

5. Duchess

6. Duke

7. (in the US and Canada) Doctor

D

⁵

abbreviation

1. Deutsch: indicating the serial number in the catalogue (1951) of the musical compositions of Schubert made by Otto Deutsch (1883–1967)

D

⁶

symbol

1. music

   1. 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

   2. a key, string, or pipe producing this note

   3. the major or minor key having this note as its tonic

2. chem deuterium

3. maths the first derivative of a function, as in D( x ³ + x ²) = 3 x ² + 2 x

4. physics

   1. dispersion

   2. electric displacement

5. aeronautics drag

6. 1. a semiskilled or unskilled manual worker, or a trainee or apprentice to a skilled worker

   2. ( as modifier ) See also occupation groupings

      D worker

7. 500 See Roman numerals

abbreviation

1. Germany (international car registration)

2. 1. informal,  defence

      I'm playing D in the match this afternoon

   2. informal,  defensive play

d

⁷

/ diː /

noun

1. the fourth letter and third consonant of the modern English alphabet

2. a speech sound represented by this letter, usually a voiced alveolar stop, as in dagger

3. 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

d

1. Abbreviation of diameter

Word History and Origins

Origin of D¹

From the Latin word denāriī

Origin of D²

From the Latin word dā

Word History and Origins

Origin of D¹

(sense 3 and 6) Latin denarius

Origin of D²

(for sense 8) from German Deutschland

Example Sentences

If they made a $100 monthly contribution in an investment account that began with $0 and kept that contribution amount the same for 40 years, assuming a conservative and constant 5% interest rate that is compounded annually, they’d have about $145,000 at age 65.

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We aren’t Weimar Germany just yet, but we aren’t quite as far from it as we’d like to be.

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Making this point inimitably, President Franklin D. Roosevelt once said in a speech to the Daughters of the American Revolution: “Remember always that all of us, and you and I especially, are descended from immigrants and revolutionists.”

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That’s as fantastical of a demand as Sidney Lumet’s 1978 “The Wiz” insisting that the great diva Diana Ross’s Dorothy was a nervous nelly who’d never been south of Harlem’s 125th Street.

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But she'd "always dreamed" of doing a West End show, she said.

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