Usually means: Security Identifier in computing systems.
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We found 27 dictionaries that define the word SID:

General (8 matching dictionaries)
  1. SID, SID: Merriam-Webster
  2. Sid, sid: Wordnik
  3. SID, Sid, sid, sid': Wiktionary
  4. Sid: Infoplease Dictionary
  5. SID: Dictionary.com
  6. SID (band), SID, Sid (Ice Age), Sid (Skins episode), Sid (Skins series Sid+++(Skins+++series+++1)), Sid (Toy Story), Sid (band), Sid (given name), Sid: Wikipedia, the Free Encyclopedia
  7. Sid: Rhymezone
  8. SID: Stammtisch Beau Fleuve Acronyms

Art (1 matching dictionary)
  1. -sid: A Cross Reference of Latin and Greek Elements

Business (1 matching dictionary)
  1. Abbreviations in shipping (No longer online)

Computing (3 matching dictionaries)
  1. BABEL: Computer Oriented Abbreviations and Acronyms (No longer online)
  2. Webopedia (No longer online)
  3. SID, Sid (Debian), Sid (Sesame Street): Encyclopedia

Medicine (2 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)
  2. SID, s.i.d: Medical dictionary

Miscellaneous (3 matching dictionaries)
  1. baby names list (No longer online)
  2. SID: Acronym Finder
  3. AbbreviationZ (No longer online)

Slang (3 matching dictionaries)
  1. Sid (offensive): Racial Slur Database
  2. sid: Green’s Dictionary of Slang
  3. S.I.D, sid: Urban Dictionary

Tech (6 matching dictionaries)
  1. SID: GEOGRAPHIC INFORMATION SYSTEMS, CARTOGRAPHY, AND REMOTE SENSING
  2. AUTOMOTIVE TERMS (No longer online)
  3. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)
  4. Glossary of Meteorology (No longer online)
  5. Rane Professional Audio Reference (No longer online)
  6. SOLAR-TERRESTRIAL TERMS (No longer online)

Definitions from Wiktionary (SID)

noun:  A short form of the male given names Sidney and Siddhartha.
noun:  A minor river in East Devon, England, which flows into the English Channel at Sidmouth.
noun:  (slang) sadiki
noun:  (computing) Sound Interface Device, a sound chip used in some early computers.
noun:  (medicine) once a day, such as for the administration of medication. From Latin semel in die.
noun:  Alternative form of Syd (“unisex given name”). [(countable) A diminutive of the unisex given name Sydney.]
noun:  (computing, Microsoft Windows) Abbreviation of security identifier.
noun:  (aviation) Initialism of standard instrument departure.

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