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• 'd
  'd

  contraction of had:
• D
  D

  noun

  the fourth letter of the English alphabet, a consonant.
• D-
  D-

  (of a molecule) having a configuration resembling the dextrorotatory isomer of glyceraldehyde: always printed as a small capital, roman character.
• d'
  d'

  preposition

  de (used in French names as an elided form ofde ).
• d-
  d-

  dextrorotatory; dextro- (distinguished from l-).
• d.
  d.

  abbreviation

  (in prescriptions) give.
• D.
  D.

  abbreviation

  day.
• d
  d

  symbol

  physics density or relative density

'd

¹ American  

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.

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D ² American  

[dee] / di /

Or d

noun

• D's,
  plural
• Ds,
  plural
• d's,
  plural
• ds
  plural

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.

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D ³ American  

abbreviation

1. Electricity. debye; debyes.

2. deep.

3. depth.

4. Optics. diopter.

5. divorced.

6. Dutch.

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D ⁴ American  

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.

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D- ⁵ American  

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

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d' ⁶ American  

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.

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d' ⁷ American  

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

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

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d- ⁸ American  

Symbol, Chemistry, Biochemistry.

1. dextrorotatory; dextro- (distinguished from l-).

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d. ⁹ American  

abbreviation

1. (in prescriptions) give.

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d. ¹⁰ American  

abbreviation

1. British. pence.

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d. ¹¹ American  

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.

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D. ¹² American  

abbreviation

1. day.

2. December.

3. Democrat.

4. Democratic.

5. Physics. density.

6. Deus.

7. Deuteronomy.

8. Doctor.

9. dose.

10. Dutch.

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D. ¹ British  

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

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D ² British  

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

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abbreviation

1. Germany (international car registration)

2. 1. informal defence

      I'm playing D in the match this afternoon

   2. informal defensive play

'd ³ British  

contraction

1. would or had

   I'd

   you'd

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d ⁴ British  

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

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d ⁵ British  

/ 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

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D ⁶ British  

abbreviation

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

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d. ⁷ British  

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)

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d Scientific  

1. Abbreviation of diameter

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Other Word Forms

Noun Inflected Forms

• D's
  plural
• Ds
  plural
• d's
  plural
• ds
  plural

Etymology

Origin of d.⁹

From the Latin word dā

Origin of d.¹⁰

From the Latin word denāriī

Example Sentences

See Examples For:

'd D D- d' d- d. D. d D's Ds d's ds

“If they had said, ‘We’re going to do this for another 20 years,’ I ‘d have been on board in a heartbeat.”

From Los Angeles Times ● May 27, 2026

But still, one by one, we ’d all burned out.

From Salon ● May 7, 2024

“Why, this diggin’ ’d make it look like thirty cents.

From Slate ● Nov. 25, 2018

We ’d be fixing the economy, ad- dressing national security issues, and improving education.

From MSNBC ● Sep. 9, 2014

The gravitational tug is so strong that you ’d be torn apart in a fraction of a second.

From "Zero: The Biography of a Dangerous Idea" by Charles Seife

During that time, older adults can switch from traditional Medicare to a private Medicare Advantage plan, change from one Medicare Advantage plan to another, and join or change their Medicare Part D prescription-drug plan.

From MarketWatch ● Aug. 11, 2026

"This is what makes this case so fascinating. The two biggest pieces of evidence against Keffe D came from Keffe D," trial attorney Shaun Kent told the BBC.

From BBC ● Aug. 10, 2026

Participants consuming more dairy, however, showed improvements in blood pressure and consumed more calcium, protein, and vitamin D.

From Science Daily ● Aug. 9, 2026

The subsidies were distorting prices and competition in the Part D market.

From The Wall Street Journal ● Aug. 6, 2026

D leaves the barbershop, checking his reflection in every mirror he walks by.

From "Isaiah Dunn Is My Hero" by Kelly J. Baptist

In their most recent assessment, for example, transit scored a D- and hazardous waste a D+.

From National Geographic ● Jul. 17, 2023

Louisiana’s drinking water infrastructure limps in with a D-.

From Washington Post ● Jun. 16, 2021

Ms. E.K. announced that she would be holding before-school tutoring sessions, which Sarah, who finished the fall semester with a D-, never would have attended during remote learning.

From New York Times ● May 13, 2021

Instead, Sen. Patrick Leahy, D- Vt., who serves in the largely ceremonial role of Senate president pro tempore, is set to preside.

From Seattle Times ● Jan. 25, 2021

Captain D- rode, and had the best of it. 

From Letters from the Cape by Lady Lucie Duff Gordon

In the A.I. age, Maggie Hennessy asserts, sparring with a grouchy maître d’ over the phone is part of what makes dining out great.

From Slate ● Jul. 24, 2026

Flanked by tuxedoed servers and the maître d’, she announced the founder’s death, mostly silencing the crowded dining room.

From Los Angeles Times ● Aug. 17, 2025

“They’re like a private maitre d’ now,” said Nicky Haslam, 84, the English interior designer and social fixture.

From Seattle Times ● May 16, 2024

“A lot of times, you won’t even see the dog” until you seat the owners, said Ally Gallegos, a former maître d’ at an upscale neighborhood restaurant in the West Village.

From New York Times ● May 16, 2024

“How d’ ye do?—how d’ye do?—Very well, I thank you.

From "Emma" by Jane Austen

Ke5, Muzychuk can’t hold back both the d- and g-pawns indefinitely and resigned.

From Washington Times ● Dec. 27, 2022

Both the d- and f-block elements react with nonmetals to form binary compounds; heating is often required.

From Textbooks ● Feb. 14, 2019

They're called d- and l-isomers—d for dextro, l for levo; right and left, you see.

From A Feast of Demons by Joseph Samachson

New Designs University Park, 16-25, 25-22, 25-21, 22-25, 15-13 Jordan d. 25-23, 25-19, 25-10 Westchester d.

From Los Angeles Times ● Oct. 31, 2024

But just as bell hooks, the feminist writer, and k. d. lang, the singer-songwriter, often see their names appear with unwanted capital letters, lowercase compositions are often capitalized on their way to publication.

From New York Times ● Mar. 17, 2017

From part d. we see that receiving $1 million dollars per year indefinitely is worth $20 million dollars in today’s dollars.

From Textbooks ● Mar. 30, 2016

Use your answers to parts a. and d. to determine which of the three options is best.

From Textbooks ● Mar. 30, 2016

Blaze, Berkley pbo or pbr, n. d. no data except “trash”.

From Checklist A complete, cumulative Checklist of lesbian, variant and homosexual fiction, in English or available in English translation, with supplements of related material, for the use of collectors, students and librarians. by Marion Zimmer Bradley

One of the suspects charged in Poland, a Ukrainian called Vladyslav D., described in detail to investigators how he made multiple long car trips in July 2024 following instructions from someone he knew as "Warrior".

From BBC ● Aug. 7, 2026

During the Great Depression, President Franklin D. Roosevelt proposed social insurance as a new approach to economic security.

From MarketWatch ● Aug. 3, 2026

“Empire of Ashes” opens with the sudden death of President Franklin D. Roosevelt and Harry Truman’s awkward ascent to the presidency.

From The Wall Street Journal ● Jul. 31, 2026

Sturgis, Rogers and Ames were all in Fields’ Echo Theater Company production of Samuel D. Hunter’s “Clarkston,” a more scrupulously observed relationship drama with its own share of surprising turns.

From Los Angeles Times ● Jul. 21, 2026

Before lunch he’d swim laps in the White House pool, originally installed so Franklin D. Roosevelt could exercise muscles damaged by polio.

From "Fallout: Spies, Superbombs, and the Ultimate Cold War Showdown" by Steve Sheinkin

KKR’s fee-related earnings jumped 37% from a year ago, and the firm raise d more than $34 billion.

From The Wall Street Journal ● Jul. 30, 2026

Researchers estimate that Beta Pictoris d has at least twice the mass of Jupiter.

From Science Daily ● Jul. 23, 2026

However, astronomers did not initially recognize Beta Pictoris d as a bright point of light.

From Science Daily ● Jul. 23, 2026

Newport Harbor, 25-16, 25-17, 25-22 Redondo Union d.

From Los Angeles Times ● May 5, 2026

SCORPIUS/HARRY: And you’re sure it’s in there? d guard walks past.

From "Harry Potter and the Cursed Child" by J.K. Rowling

What drives customers to storage, Dietz says are the four D’s: downsizing, decluttering, divorce and death.

From The Wall Street Journal ● Apr. 15, 2026

Because inflammation can accelerate telomere damage, vitamin D's anti-inflammatory properties may help explain its apparent protective effects.

From Science Daily ● Oct. 22, 2025

In fact, studies show that 66% of students who earn all A's play organized sports compared to just 24% of students with mostly D's and F's.

From Salon ● Jan. 1, 2025

When he first heard Public Enemy in sixth or seventh-grade, Chuck D’s voice sounded invincible, like he could take on the world alone.

From Los Angeles Times ● Sep. 9, 2024

The light reflected in Mr. D’s eyes, giving him a sinister look.

From "The Titan's Curse" by Rick Riordan

Only eight banks got Bs, while the majority got Cs; 36 got Ds.

From MarketWatch ● Feb. 27, 2026

Law enforcement sources said this could have been a reference to the "three Ds of insurance" - tactics used by companies to reject payment claims by patients.

From BBC ● Feb. 21, 2025

The same four Ds applied: death, divorce, dislocation, and disaster/downsizing.

From Slate ● Aug. 5, 2024

Her grades fell to Ds, and she thought, “College just may not be for me.”

From Los Angeles Times ● Oct. 10, 2023

Disappointed with Ds, pleasantly satisfied with Cs, and celebratory about a B, I allowed my standards at school to become pathetic.

From "The Other Wes Moore: One Name, Two Fates" by Wes Moore

The researchers intend to continue examining Webb's observations to refine their estimates of Beta Pictoris d's temperature, atmospheric composition, and orbit.

From Science Daily ● Jul. 23, 2026

A small illustration of the eponymous rat hangs in the restaurant, signed by director Brad Bird, who spent days sketching the dining room, capturing the lamps, cheese trolley and maitre d's outfit.

From BBC ● Jan. 29, 2024

Occasionally a twinkling golden figure zigzagged the room — it was one of the restaurant’s maître d’s, wearing a fully sequined gown that Bella Hadid modeled during Ralph Lauren’s fall 2019 runway show.

From New York Times ● Oct. 23, 2021

Dinner maitre d’s are gently professional, warm and welcoming.

From Washington Times ● Jul. 17, 2018

Cologne made me think of voice coaches, of maitre d’s, of old men and their unwanted embraces.

From "Middlesex: A Novel" by Jeffrey Eugenides

The Cyclones closed the third quarter with a pair of 3-pointers, the second by Ryan in the closing secon ds, that put ISU on top 49-47.

From Seattle Times ● Jan. 18, 2023

Senior forward Oscar ds Silva has played well all season and was named the Pac-12 player of the week after averaging 19.8 points and 11 rebounds in three games last week.

From Washington Times ● Jan. 13, 2021

The number of ds that were added to a1 is one less than the number of the term.

From Textbooks ● May 6, 2020

As a result, we would incorrectly conclude that ds = 0.

From Textbooks ● Mar. 30, 2016

Marius Victorinus remarks: "If z were essential to the Latin language, we should represent it by ds."

From Latin Pronunciation A Short Exposition of the Roman Method by Harry Thurston Peck