Usually means: Cause slight disturbance to system.
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We found 30 dictionaries that define the word perturb:

General (25 matching dictionaries)
  1. perturb: Merriam-Webster.com
  2. perturb: Oxford Learner's Dictionaries
  3. perturb: American Heritage Dictionary of the English Language
  4. perturb: Collins English Dictionary
  5. perturb: Vocabulary.com
  6. perturb: Wordnik
  7. perturb: Cambridge Advanced Learner's Dictionary
  8. perturb: Wiktionary
  9. perturb: Webster's New World College Dictionary, 4th Ed.
  10. perturb: The Wordsmyth English Dictionary-Thesaurus
  11. perturb: Infoplease Dictionary
  12. Perturb, perturb: Dictionary.com
  13. perturb: Online Etymology Dictionary
  14. Perturb: Wikipedia, the Free Encyclopedia
  15. Perturb: Online Plain Text English Dictionary
  16. perturb: Webster's Revised Unabridged, 1913 Edition
  17. perturb: Rhymezone
  18. perturb: AllWords.com Multi-Lingual Dictionary
  19. perturb: Webster's 1828 Dictionary
  20. perturb: Free Dictionary
  21. perturb: Mnemonic Dictionary
  22. perturb: Dictionary/thesaurus
  23. perturb: Wikimedia Commons US English Pronunciations

Business (1 matching dictionary)
  1. perturb: Legal dictionary

Computing (1 matching dictionary)
  1. perturb: Encyclopedia

Medicine (1 matching dictionary)
  1. perturb: Medical dictionary

Science (1 matching dictionary)
  1. perturb: Nine Planets Glossary

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

(Note: See perturbable as well.)

Definitions from Wiktionary (perturb)

verb:  To disturb; to bother or unsettle.
verb:  (physics) To slightly modify the motion of an object.
verb:  (astronomy) To modify the motion of a body by exerting a gravitational force.
verb:  (mathematics) To modify slightly, such as an equation or value.

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