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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:

I link the onset of my SD to my intubation rather than my profession, but honestly, I can’t be sure if that’s what caused it.

From Slate Apr. 18, 2026

It pegs SD Guthrie and Hap Seng Plantations as its top picks.

From The Wall Street Journal Nov. 19, 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

Riding for Team SD Worx, the 29-year-old claimed victory in thrilling style by winning a four-way sprint finish ahead of France's Pauline Ferrand-Prevot, Liane Lippert of Germany and Poland's Katarzyna Niewiadoma-Phinney.

From BBC Apr. 6, 2025

For the same body, the SD varies with the distance.

From Lectures in Navigation by Draper, Ernest Gallaudet

Waterhouse bore away to the sd. sloop to Consult with Capt.

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

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

Robert Cook, master of the Shipe Called the blow dove of london. the sd. wm.

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

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

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

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 Campbell, Helen

Error bars represent s.d. of two biological replicates. e, Average editing levels of sites in different tissues from wild-type and Adar2−/− mice.

From Nature Oct. 10, 2017

Data are mean ± s.d. f, Quantification of proportions of OCT4-null, mosaic or wild-type mouse blastocysts after microinjection of the sgRNA2b–Cas9 ribonucleoprotein complex at concentrations indicated.

From Nature Sep. 19, 2017

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

From Nature Mar. 19, 2017

Mean ± s.d., n = 3 biological replicates for each species tested.

From Nature May 3, 2016

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

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

Appeared in the June 26, 2026, print edition as 'Lead, S.D.

From The Wall Street Journal Jun. 25, 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

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

George Trumbal of London being their Owner of sd.

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

How came you, after you had heard this Talk between Phœbe and Phillis, to get her 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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