SD
1 Americanabbreviation
abbreviation
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sea-damaged.
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South Dakota (approved especially for use with zip code).
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Statistics. standard deviation.
abbreviation
abbreviation
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school district.
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sight draft.
abbreviation
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sine die.
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Statistics. standard deviation.
abbreviation
abbreviation
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sea-damaged.
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senior deacon.
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South Dakota.
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special delivery.
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Statistics. standard deviation.
abbreviation
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South Dakota
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Also: sd. statistics standard deviation
abbreviation
abbreviation
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sine die
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sound
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philosophy sense datum
abbreviation
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?
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
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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)
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.