Usually means: Russian security agency, successor KGB.
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We found 21 dictionaries that define the word FSB:

General (11 matching dictionaries)
  1. FSB: Collins English Dictionary
  2. FSB: Vocabulary.com
  3. fsb: Wordnik
  4. FSB: Wiktionary
  5. fsb: Dictionary.com
  6. FSB (Russia), FSB (band), FSB: Wikipedia, the Free Encyclopedia
  7. Fsb: Rhymezone
  8. FSB: Stammtisch Beau Fleuve Acronyms
  9. fsb: FreeDictionary.org
  10. fsb: Mnemonic Dictionary
  11. FSB: TheFreeDictionary.com

Computing (4 matching dictionaries)
  1. FSB: Free On-line Dictionary of Computing
  2. fsb: CCI Computer
  3. FSB: Tech Terms Computer Dictionary
  4. FSB: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

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

Slang (1 matching dictionary)
  1. f.s.b, fsb: Urban Dictionary

Tech (2 matching dictionaries)
  1. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)
  2. Sweetwater Music (No longer online)

(Note: See fsbs as well.)

Definitions from Wiktionary (FSB)

noun:  (initialism, Russia, politics, espionage, law enforcement) The Federal Security Service of the Russian Federation.
noun:  (computing) Initialism of front-side bus. [(computing) A bus that conducts data between a CPU and a memory controller.]
noun:  Initialism of Federation of Small Businesses.

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