Usually means: Switch user or substitute user.
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We found 29 dictionaries that define the word su:

General (12 matching dictionaries)
  1. SU, su: Merriam-Webster
  2. SU: Collins English Dictionary
  3. SU, Su, Su, su, su, su, su, sU: Wordnik
  4. Su: Wiktionary
  5. Su: Webster's New World College Dictionary, 4th Ed.
  6. su-: Infoplease Dictionary
  7. SU(n), su, su-: Dictionary.com
  8. SU(2), SU(3), SU(6) (physics), SU(N), SU(n), SU, Su-, Su (Rip Slyme), Su (Shugo Chara!), Su (Unix), Su (computing), Su (kana), Su (surname), Su, .su: Wikipedia, the Free Encyclopedia
  9. Su: Rhymezone
  10. su, su, su (de ella), su (de ellos), su (de l): AllWords.com Multi-Lingual Dictionary
  11. SU, .su, su: Stammtisch Beau Fleuve Acronyms
  12. SU: TheFreeDictionary.com

Art (2 matching dictionaries)
  1. Epicurus.com Sushi Glossary (No longer online)
  2. Glossary of Stamp Collecting Terms (No longer online)

Business (1 matching dictionary)
  1. Glossary of Crop Abbreviations (No longer online)

Computing (3 matching dictionaries)
  1. su: Free On-line Dictionary of Computing
  2. SU: Netlingo
  3. SU: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. Su-: Medical dictionary

Miscellaneous (2 matching dictionaries)
  1. SU(n), SU: Acronym Finder
  2. AbbreviationZ (No longer online)

Science (3 matching dictionaries)
  1. SU: Eric Weisstein's World of Mathematics
  2. SU: Extragalactic Astronomy
  3. su: A Dictionary of Quaternary Acronyms and Abbreviations

Slang (1 matching dictionary)
  1. S.U, s.u, su: Urban Dictionary

Tech (3 matching dictionaries)
  1. SU: GEOGRAPHIC INFORMATION SYSTEMS, CARTOGRAPHY, AND REMOTE SENSING
  2. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)
  3. The Turkish Food and Beverage Page (No longer online)

Definitions from Wiktionary (SU)

noun:  A diminutive of the female given name Susan and of its variant forms.
noun:  A Chinese surname from Mandarin.
noun:  Alternative form of xu (“former Vietnamese currency”) [A former unit of currency in Vietnam, equivalent to a hundredth of a dong.]
noun:  Abbreviation of Sunday. [The first day of the week in many religious traditions, and the seventh day of the week in systems using the ISO 8601 standard; the Christian Sabbath; the Lord's Day; it follows Saturday and precedes Monday.]
noun:  Initialism of Soviet Union. [(informal, historical) The Russian Soviet Federative Socialist Republic.]
noun:  Any of several universities:
noun:  Initialism of Sabancı University.
noun:  Initialism of Salisbury University.
noun:  Initialism of Seattle University.
noun:  Abbreviation of Seton Hall University.
noun:  Initialism of Shippensburg University.
noun:  Initialism of Silliman University.
noun:  Initialism of Silpakorn University.
noun:  Initialism of Sofia University.
noun:  Initialism of South University.
noun:  Initialism of Stanford University.
noun:  Initialism of Stellenbosch University.
noun:  Initialism of Stockholm University.
noun:  Initialism of Syracuse University.
noun:  Abbreviation of North Sumatra, a province of Indonesia. [A province of Indonesia.]
noun:  Initialism of students' union. [(UK) A student organization present in many colleges, universities, and high schools. In higher education, the students' union is often accorded its own building on the campus, dedicated to social, organizational activities, and representation.]
noun:  (algebra) Abbreviation of special unitary group. [(linear algebra, group theory) For given n, the group of n×n unitary matrices with complex elements and determinant equal to one.]
noun:  Initialism of state university.
noun:  Initialism of statistical unit.

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