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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

If women were fully represented in politics, our national priorities would expand and solutions would be smarter and more diverse, and we ’d have a stronger economy and nation.

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

Average grades in preparatory math, precalculus and calculus across UC continue their five-year decline, while D and F grades, no-pass marks and withdrawals in those courses have gone up.

From Los Angeles Times ● Sep. 17, 2026

While an increasing number of London boroughs have seen council tax on a Band D property rise above the £2,000 mark, in Wandsworth, council tax on an average Band D property is currently £1,020.35.

From BBC ● Sep. 16, 2026

They suggest, "Preoperative vitamin D supplementation in breast cancer patients with vitamin D levels below 30 nmol/L may have a role in modulating postoperative pain."

From Science Daily ● Sep. 14, 2026

NextEra Energy NEE -0.16%decrease; down pointing triangle and Dominion Energy D -1.06%decrease; down pointing triangle have proposed an expanded state benefits package to regulators as they look to secure approval for their $67 billion merger.

From The Wall Street Journal ● Sep. 14, 2026

But music that is in D minor will have a different quality, because the notes in the minor scale follow a different pattern and so have different relationships with each other.

From "Understanding Basic Music Theory" by Catherine Schmidt-Jones and Russel Jones

On Jan. 24, the state Senate passed SB 5010 to specifically include fentanyl in the endangerment law by 48-1, with only state Sen. Rebecca Saldaña, D- Seattle, voting nay.

From Seattle Times ● Feb. 13, 2024

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

From National Geographic ● Jul. 17, 2023

CBS Sports graded the trade a D- for the Wizards.

From Washington Times ● Jan. 24, 2023

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

From Washington Post ● Jun. 16, 2021

There was one in the large, straggling half-village, half-town of D-, within about ten miles of me, and the pulpit was then vacant.

From Autobiography of Mark Rutherford, Edited by his friend Reuben Shapcott by Mark Rutherford

The maître d’ escorted us to a banquette near a window facing northeast.

From The Wall Street Journal ● Sep. 9, 2026

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

The maître d’ was so rude and they called security on us,” says Bernad.

From Los Angeles Times ● Apr. 27, 2026

“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

Looking more like a restaurant maitre d’ than a cowboy, Joel opened the gate between the two paddocks.

From "The Omnivore's Dilemma" by Michael Pollan

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

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

From Textbooks ● Mar. 30, 2016

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

The face, a. b. c. d., responds to light on opaque pigment, as we have determined.

From Voices from the Past by Paul Alexander Bartlett

Samuel D. Hunter writes compact human dramas that pack a maximal punch.

From Los Angeles Times ● Sep. 9, 2026

"Diamond frogs have been hiding their diversity beneath our feet," said Dr. Mark D. Scherz, Curator of Herpetology at the Natural History Museum Denmark and lead author of the study.

From Science Daily ● Aug. 30, 2026

During World War II, the administration of Franklin D. Roosevelt created a state company to get foreign reserves and sought to buy a U.S. company that had concessions in Saudi Arabia.

From The Wall Street Journal ● Aug. 28, 2026

Solicitor General D. John Sauer told the court the project is already 65% complete and argued that stopping construction would interfere with security improvements at the White House.

From Salon ● Aug. 15, 2026

Uncle D. Always happy, singing, and still doing the Watusi when that dance had been long gone.

From "P.S. Be Eleven" by Rita Williams-Garcia

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

Astronomers had previously proposed that an undiscovered planet similar to Beta Pictoris d might be shaping the disk and producing some of those features.

From Science Daily ● Jul. 23, 2026

The presence of Beta Pictoris d could also help astronomers understand the unusual appearance of the system's debris disk.

From Science Daily ● Jul. 23, 2026

Fountain Valley, 25-20, 25-14, 25-16 St. Margaret’s d.

From Los Angeles Times ● May 5, 2026

Ear and Eye watched warily as he tied a series of knots in the rope that the trembling maitre d ’ fetched from a storeroom.

From "The Ear, the Eye, and the Arm" by Nancy Farmer

Down the street at D’s Thirsty Beaver bar, Danielle Rees is doing a test run on serving breakfast.

From The Wall Street Journal ● Aug. 16, 2026

The study, published in the December issue of The American Journal of Clinical Nutrition, adds clarity to long-standing debates about vitamin D's links to colorectal cancer and other diseases.

From Science Daily ● Dec. 30, 2025

And what makes Mickey D’s breakfast interesting, suggested CNBC’s Carl Quintanilla, is that it could be considered a “proxy for employment. You’re more likely to visit if you have somewhere to go in the morning.”

From Slate ● Aug. 8, 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

“Yeah, it was rough. But I got an A. Let’s go to Mickey D’s and get something to eat before the game.”

From "Forged by Fire" by Sharon M. Draper

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

"She says you haven't shown enough yet for why we need to seal the list—eg can you maybe redact—or why you need me to make Ds 'acknowledge' it," he wrote.

From Salon ● Jun. 27, 2023

He had been getting Cs and Ds, and college never felt like home, anyway.

From "Class Matters" by The New York Times

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

Chrostowski has changed out of his jogging gear into the maitre d’s dark suit and bow-tie.

From The Guardian ● Nov. 26, 2019

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

From Washington Times ● Jul. 17, 2018

He pronounced the words lazily, blunting the t’s to d’s so that it sounded like “siddle lister.”

From "Educated" by Tara Westover

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

If f is a continuous function on a smooth curve C, then ∫C f ds always exists.

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