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• SD
  SD

  abbreviation

  the intelligence and counterespionage service of the Nazi SS.
• sd.
  sd.

  abbreviation

  sound.
• S/D
  S/D

  abbreviation

  school district.
• s.d.
  s.d.

  abbreviation

  sine die.
• S.D.
  S.D.

  abbreviation

  doctor of science.
• sd
  sd

  abbreviation

  sine die

SD

¹ American  

abbreviation

1. the intelligence and counterespionage service of the Nazi SS.

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SD ² American  

abbreviation

1. sea-damaged.

2. South Dakota (approved especially for use with zip code).

3. Statistics. standard deviation.

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sd. ³ American  

abbreviation

1. sound.

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S/D ⁴ American  

abbreviation

1. school district.

2. sight draft.

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s.d. ⁵ American  

abbreviation

1. sine die.

2. Statistics. standard deviation.

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S.D. ⁶ American  

abbreviation

1. doctor of science.

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S.D. ⁷ American  

abbreviation

1. sea-damaged.

2. senior deacon.

3. South Dakota.

4. special delivery.

5. Statistics. standard deviation.

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SD ¹ British  

abbreviation

1. South Dakota

2. Also: sd. statistics standard deviation

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abbreviation

1. Swaziland (international car registration)

sd ² British  

abbreviation

1. sine die

2. sound

3. philosophy sense datum

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sd ³ British  

abbreviation

1. Sudan

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Etymology

Origin of SD¹

From the German word Sicherheitsdienst

Origin of S.D.⁶

From Latin Scientiae Doctor

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Example Sentences

See Examples For:

SD sd. s.d. S.D. sd

I had more trouble with voiceless consonants than voiced ones—one of the sample sentences for this type of SD reduced my voice to a whisper on nearly every syllable.

From Slate ● Apr. 18, 2026

SD Guthrie and Genting Plantations have flagged potential charges, he notes.

From The Wall Street Journal ● Feb. 4, 2026

Edward Snowden removed information using a SD memory card he hid on some occasions in a Rubik’s cube.

From Salon ● Jun. 30, 2025

San Diego County also offers the free SD Emergency app, which includes the ShakeReadySD earthquake early warning tool.

From Los Angeles Times ● Apr. 14, 2025

The square which contains WA is in line S, column D. So I put down SD.

From The Treasure-Train by Arthur B. (Arthur Benjamin) Reeve

How do you know your sd. master was poisoned with that Lead?

From The Trial and Execution, for Petit Treason, of Mark and Phillis, Slaves of Capt. John Codman Who Murdered Their Master at Charlestown, Mass., in 1755; for Which the Man Was Hanged and Gibbeted, and the Woman Was Burned to Death. Including, Also, Some Account of Other Punishments by Burning in Massachusetts by Abner Cheney Goodell

Sutton sd. att yt tyme there was noe dogg there, but his wch was a puppy, & Mr Danes that would not byte.

From Anne Bradstreet and Her Time by Helen Campbell

Drakes his bay, Because that when he was their he water'd. their is a brave fresh water River, And to thiss day is standing a church which the sd. cap.

From Privateering and Piracy in the Colonial Period Illustrative Documents by J. Franklin (John Franklin) Jameson

King of England: Van den Derden Edewaert, Coning van Engelant, Rymkronyk geschreven het Jaer 1347, door Jan de Klerk van Antwerpen, 8vo., sd., scarce, 1s. 6d.

From Notes and Queries, Number 58, December 7, 1850 A Medium of Inter-communication for Literary Men, Artists, Antiquaries, Genealogists, etc. by George Bell

Paris, 1818. ——, another edition, 8 vols. royal 8vo. sd. 36s.

From Notes and Queries, Number 42, August 17, 1850 by Various

Data are mean ± s.d. from three independent experiments.

From Nature ● Sep. 19, 2017

We then defined a threshold that was 2 s.d. of the firing rate, but not below 0.2 Hz and not above 1 Hz.

From Nature ● Mar. 28, 2017

In a and d–j, data represent mean ± s.d.

From Nature ● Mar. 19, 2017

In c, d, and f, data represent mean ± s.d.

From Nature ● Mar. 19, 2017

By various Acts of Parliament, the Overseers have now to collect other rates, but the proportion required for the poor is thus shown:— Year Rate in  £. s.d.

From Showell's Dictionary of Birmingham A History and Guide Arranged Alphabetically by Thomas T. Harman

It took Jon Rapp, 54, a clinical social worker from Pierre, S.D.,

From The Wall Street Journal ● Aug. 14, 2026

In addition to naming colonial-era outposts like St. Louis and Detroit, French-speaking settlers and traders gave their names to Dubuque, Iowa; Duluth, Minn.; and Pierre, S.D.; among others.

From The Wall Street Journal ● Aug. 11, 2026

He regularly stops in smaller places like Bismarck, N.D., and Rapid City, S.D., to “pick up another week of playing,” he said.

From Los Angeles Times ● Jan. 16, 2024

The courtyard of the Oglala Lakota Artspace in Kyle, S.D., features a stainless steel sculpture representing Star Knowledge.

From New York Times ● Jan. 9, 2024

Pretending to be the owner of the house, the S.D. man had invited Jop in.

From "The Hiding Place" by Corrie ten Boom

Test statistic = 2.18. p-value = 0.0719 using ⎛ x¯ d = 3.71, sd = 4.5⎞ .

From Textbooks ● Mar. 27, 2020

Cornered, I moved content on to a micro sd card, using an external card reader, then moved that card into the phone.

From The Guardian ● Mar. 31, 2018

Using the differences data, calculate the sample mean and the sample standard deviation. x¯ d = 3.71, sd = 4.5.

From Textbooks ● Sep. 19, 2013

And that any new elected Governor may be sworn before any two Governors at such meeting to be true and faithful towds the sd School.

From A History of Giggleswick School From its Foundation, 1499 to 1912 by Edward Allen Bell

Kerr Gibbons to get Poyson, & had askt sd Kerr whither Phœbe had not been wth him for sd Poyson.

From The Trial and Execution, for Petit Treason, of Mark and Phillis, Slaves of Capt. John Codman Who Murdered Their Master at Charlestown, Mass., in 1755; for Which the Man Was Hanged and Gibbeted, and the Woman Was Burned to Death. Including, Also, Some Account of Other Punishments by Burning in Massachusetts by Abner Cheney Goodell

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