Usually means: Standard deviation, measures data dispersion.
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We found 56 dictionaries that define the word std:

General (21 matching dictionaries)
  1. std: Longman Dictionary of Contemporary English
  2. STD, std: Merriam-Webster
  3. STD, std: Oxford Learner's Dictionaries
  4. STD, std: American Heritage Dictionary of the English Language
  5. std: Collins English Dictionary
  6. STD: Vocabulary.com
  7. Std, std: Wordnik
  8. STD, std: Cambridge Advanced Learner's Dictionary
  9. S.T.D, std: Wiktionary
  10. std: Webster's New World College Dictionary, 4th Ed.
  11. std: The Wordsmyth English Dictionary-Thesaurus
  12. STD: Infoplease Dictionary
  13. STD, s.t.d, std: Dictionary.com
  14. std: Cambridge Essential American English Dictionary
  15. S.T.D, S.T.D (Shelters to Deltas), STD, Std: Wikipedia, the Free Encyclopedia
  16. STD, std: Stammtisch Beau Fleuve Acronyms
  17. std: FreeDictionary.org
  18. std: Mnemonic Dictionary
  19. STD, std: TheFreeDictionary.com

Business (9 matching dictionaries)
  1. MoneyGlossary.com (No longer online)
  2. Travel Industry Dictionary (No longer online)
  3. INVESTORWORDS (No longer online)
  4. STD: bizterms.net
  5. STD: Bloomberg Financial Glossary
  6. Construction Term Glossary (No longer online)
  7. STD: Investopedia
  8. STD: Financial dictionary
  9. Glossary of Trade and Shipping Terms (No longer online)

Computing (5 matching dictionaries)
  1. STD: Free On-line Dictionary of Computing
  2. STD: Netlingo
  3. STD: CCI Computer
  4. BABEL: Computer Oriented Abbreviations and Acronyms (No longer online)
  5. STD: Encyclopedia

Medicine (14 matching dictionaries)
  1. STD: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. STD: MedTerms.com Medical Dictionary
  4. AIDSinfo Glossary (No longer online)
  5. STD: Merck Manuals
  6. online medical dictionary (No longer online)
  7. STD: HIV/AIDS Glossary
  8. Hepatitis C Information Central (No longer online)
  9. AIDS Medical Glossary and Drug Chart (No longer online)
  10. Glossary of HIV/AIDS Related Terms (No longer online)
  11. Sleep Terms (No longer online)
  12. STD: Medical dictionary
  13. STD: Drug Medical Dictionary
  14. Hyperdictionary (No longer online)

Miscellaneous (2 matching dictionaries)
  1. STD: Acronym Finder
  2. AbbreviationZ (No longer online)

Slang (2 matching dictionaries)
  1. STD: Green’s Dictionary of Slang
  2. S.T.D, STD (Stiff Thumb Disorder), Std, s.t.d: Urban Dictionary

Tech (3 matching dictionaries)
  1. AUTOMOTIVE TERMS (No longer online)
  2. Basics of Space Flight Glossary (No longer online)
  3. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)

Definitions from Wiktionary (std)

noun:  (computing) Standard library.
adjective:  Alternative form of std (“standard”)
noun:  (pathology) Initialism of sexually transmitted disease. [(pathology) Any of various diseases that are usually contracted through sexual contact.]
noun:  (telephony) Initialism of subscriber trunk dialling or subscriber toll dialing.
noun:  Initialism of short-term disability.
noun:  (rare, sometimes humorous) Initialism of save the date. [An informal notice of the date of an important upcoming event, usually a wedding, sent before a formal invitation.]
noun:  Abbreviation of standard. [A principle or example or measure used for comparison.]
noun:  Abbreviation of standard deviation. [(statistics) A measure of how spread out data values are around the mean, defined as the square root of the variance. Represented with the Greek letter σ (sigma).]

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