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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:

Detectives are now studying computers, USB sticks, SD cards and phones seized during the raids.

From BBC Jun. 4, 2026

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

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

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

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

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 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

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. g, Comparison of mutation spectrums after targeting mouse embryos with sgRNA2b plus Cas9 mRNA or protein.

From Nature Sep. 19, 2017

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

From Nature Mar. 19, 2017

In b, e, and f, data represent mean ± s.d.

From Nature Mar. 19, 2017

S.D., salutem dicit=Sends greeting. s.d., sine die=Without day.

From Chambers's Twentieth Century Dictionary (part 4 of 4: S-Z and supplements) by Various

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

But apparently no one said where exactly, because Boritt soon set out for Yankton, S.D., where he graduated from the now-defunct Yankton College in 1962.

From The Wall Street Journal Feb. 12, 2026

The company that had been based in Palo Alto is now based in Sioux Falls, S.D., according to a December filing to the U.S.

From Los Angeles Times Jan. 21, 2026

Hazardous conditions were also forecast across portions of east-central and southeastern South Dakota, southern North Dakota and Nebraska, said Kyle Weisser, a meteorologist with the National Weather Service in Sioux Falls, S.D.

From New York Times Dec. 25, 2023

I left Alex there to hitch-hike to S.D.

From "Into the Wild" by Jon Krakauer

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

Considering that I am the most ordinarie of his daughters, 'tis singular I sd have secured the best husband.

From Harper's New Monthly Magazine, Vol. 3, No. 15, August, 1851 by Various

And then the English Company remaining on board the sd.

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

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