Usually means: No operation performed by processor.
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We found 21 dictionaries that define the word nop:

General (12 matching dictionaries)
  1. nop: Longman Dictionary of Contemporary English
  2. NOP, NOP: Merriam-Webster
  3. n.o.p: Oxford Learner's Dictionaries
  4. n.o.p: American Heritage Dictionary of the English Language
  5. Nop, nop: Wordnik
  6. Nop, nop: Wiktionary
  7. NOP: Infoplease Dictionary
  8. NOP, n.o.p: Dictionary.com
  9. NOP (code), NOP (disambiguation), NOP, Nop: Wikipedia, the Free Encyclopedia
  10. Nop: Rhymezone
  11. n.o.p: TheFreeDictionary.com

Business (1 matching dictionary)
  1. Glossary of Trade and Shipping Terms (No longer online)

Computing (2 matching dictionaries)
  1. BABEL: Computer Oriented Abbreviations and Acronyms (No longer online)
  2. NOP: Encyclopedia

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

Science (1 matching dictionary)
  1. NOP: Cytokines & Cells Online Pathfinder Encyclopaedia

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

Tech (2 matching dictionaries)
  1. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)
  2. Glossary of Agricultural Terms, Programs and Laws (No longer online)

Definitions from Wiktionary (NOP)

noun:  (programming) A no-op; a CPU instruction that does nothing.
verb:  (programming) To replace machine code with nop instructions when modifying software.
noun:  A surname.
noun:  (rail transport) The station code of North Point in Hong Kong.
noun:  Alternative letter-case form of nop [(programming) A no-op; a CPU instruction that does nothing.]
verb:  Alternative letter-case form of nop [(programming) To replace machine code with nop instructions when modifying software.]

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