Usually means: Power supply unit for electronics.
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We found 17 dictionaries that define the word psu:

General (5 matching dictionaries)
  1. psu: Wordnik
  2. PSU, psu: Wiktionary
  3. PSU: Dictionary.com
  4. PSU, Psu: Wikipedia, the Free Encyclopedia
  5. PSU: Stammtisch Beau Fleuve Acronyms

Art (1 matching dictionary)
  1. Technical Glossary of Theatre Terms (No longer online)

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

Medicine (1 matching dictionary)
  1. Hepatitis C Information Central (No longer online)

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

Slang (1 matching dictionary)
  1. PSU: Urban Dictionary

Tech (4 matching dictionaries)
  1. PSU: GEOGRAPHIC INFORMATION SYSTEMS, CARTOGRAPHY, AND REMOTE SENSING
  2. Basics of Space Flight Glossary (No longer online)
  3. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)
  4. Glossary of Meteorology (No longer online)

Definitions from Wiktionary (Psu)

noun:  (initialism) Pennsylvania State University.
noun:  (electronics, computer hardware) Initialism of power supply unit.
noun:  (banking, finance) Initialism of payment service user.
noun:  (rare, oceanography) Alternative letter-case form of psu (“practical salinity unit”).
noun:  (statistics) Initialism of primary sampling unit, a sampling unit in the first stage of a polyetapic sampling.
noun:  (Philippines) Initialism of Pangasinan State University.
noun:  Initialism of practical salinity unit.

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