Usually means: Small change affecting a system.
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We found 39 dictionaries that define the word perturbation:

General (24 matching dictionaries)
  1. perturbation: Longman Dictionary of Contemporary English
  2. perturbation: Merriam-Webster
  3. perturbation: Oxford Learner's Dictionaries
  4. perturbation: American Heritage Dictionary of the English Language
  5. perturbation: Collins English Dictionary
  6. perturbation: Vocabulary.com
  7. Perturbation, perturbation: Wordnik
  8. perturbation: Cambridge Advanced Learner's Dictionary
  9. perturbation: Wiktionary
  10. perturbation: Webster's New World College Dictionary, 4th Ed.
  11. perturbation: The Wordsmyth English Dictionary-Thesaurus
  12. perturbation: Infoplease Dictionary
  13. perturbation: Dictionary.com
  14. Perturbation (astronomy), Perturbation (biology), Perturbation (geology), Perturbation (mathematics), Perturbation (quantum mechanics), Perturbation: Wikipedia, the Free Encyclopedia
  15. Perturbation: Online Plain Text English Dictionary
  16. perturbation: Webster's Revised Unabridged, 1913 Edition
  17. perturbation: Rhymezone
  18. Perturbation, perturbation (f): AllWords.com Multi-Lingual Dictionary
  19. perturbation: Webster's 1828 Dictionary
  20. perturbation: FreeDictionary.org
  21. perturbation: Mnemonic Dictionary
  22. perturbation: TheFreeDictionary.com

Art (1 matching dictionary)
  1. Perturbation: Lexicon of Linguistics

Business (2 matching dictionaries)
  1. Bouvier's Law Dictionary 1856 Edition (No longer online)
  2. perturbation: Legal dictionary

Computing (1 matching dictionary)
  1. Perturbation (mathematics), perturbation: Encyclopedia

Medicine (4 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. perturbation: Dictionary of Cancer Terms
  3. PERTURBATION: Vocabulary of Loss: Suicide, Grief, and Ethics
  4. perturbation: Medical dictionary

Science (5 matching dictionaries)
  1. Mathematical Programming (No longer online)
  2. The Computational Beauty of Nature (No longer online)
  3. Perturbation: Extragalactic Astronomy
  4. perturbation: PlanetMath Encyclopedia
  5. PERTURBATION: Zoom Astronomy Glossary

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

Tech (1 matching dictionary)
  1. Glossary of Meteorology (No longer online)

(Note: See perturbational as well.)

Definitions from Wiktionary (perturbation)

noun:  (uncountable) Agitation; the state of being perturbed
noun:  (countable) A small change in a physical system, or more broadly any definable system (such as a biological or economic system)
noun:  (countable, astronomy, physics) Variation in an orbit due to the influence of external bodies

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