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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
Synonyms

SD

1 American  

abbreviation

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


SD 2 American  

abbreviation

  1. sea-damaged.

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

  3. Statistics. standard deviation.


sd. 3 American  

abbreviation

  1. sound.


S/D 4 American  

abbreviation

  1. school district.

  2. sight draft.


s.d. 5 American  

abbreviation

  1. sine die.

  2. Statistics. standard deviation.


S.D. 6 American  

abbreviation

  1. doctor of science.


S.D. 7 American  

abbreviation

  1. sea-damaged.

  2. senior deacon.

  3. South Dakota.

  4. special delivery.

  5. Statistics. standard deviation.


SD 1 British  

abbreviation

  1. South Dakota

  2. Also: sdstatistics standard deviation

"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

abbreviation

  1. Swaziland (international car registration)

"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
sd 2 British  

abbreviation

  1. sine die

  2. sound

  3. philosophy sense datum

"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

sd 3 British  

abbreviation

  1. Sudan

"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

Etymology

Origin of SD1

From the German word Sicherheitsdienst

Origin of S.D.6

From Latin Scientiae Doctor

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

But many North Koreans used MP3 players or tiny SD cards.

From BBC Jul. 17, 2026

And all his rhetoric was deplorable: He, without any credible evidence, blames the flu vaccine for potentially triggering his SD.

From Slate Apr. 18, 2026

There’s a joke on TikTok that one person in every group is the “digital camera friend,” wrangling everyone for photos and handling SD cards and adapters.

From The Wall Street Journal Oct. 6, 2025

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

From Salon Jun. 30, 2025

Assume a line drawn through B parallel to SD, meeting SA in A' and SC in C'.

From An Elementary Course in Synthetic Projective Geometry by Lehmer, Derrick Norman

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 Bell, George

Rime e Satire, 1 vol.; together 5 vols. royal 8vo., sd., uncut, 24s.

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

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

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

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 Goodell, Abner Cheney

Madrid, 1776. ——, another copy, Large Paper, sd., uncut, 3l. 3s.

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

Data are mean ± s.d. g, Comparison of mutation spectrums after targeting mouse embryos with sgRNA2b plus Cas9 mRNA or protein.

From Nature Sep. 19, 2017

In c, d, h, and i, 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

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

From Nature Mar. 19, 2017

Paris, Maurice Dreyfous, s.d., 18mo, pp. iv-280. 55.—10.

From The Travels of Marco Polo — Volume 2 by Yule, Henry

Gracie said one of her earliest “Little House” memories is visiting the family homestead in De Smet, S.D., when she was about 5 years old, and the two have attended several cast reunions.

From The Wall Street Journal Jul. 9, 2026

Dean Lewis Buntrock was born June 6, 1931, and grew up in Columbia, S.D., a farming town that was then home to about 250 people.

From The Wall Street Journal Apr. 28, 2026

The third-worst vacancy rates nationally were at the Cheyenne, Wyo., and Rapid City, S.D., offices, which each have seven meteorologists on staff and six vacancies.

From Los Angeles Times Jul. 16, 2025

Mr. Lauinger was later able to escape after the three stopped at a gas station in Hermosa, S.D., south of Rapid City, according to court documents.

From New York Times Apr. 16, 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

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 Goodell, Abner Cheney

To the Sheriff of our County of Suffolk his under Sheriff or Deputy or any Constable of the Town of Boston in sd.

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 Goodell, Abner Cheney

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