Usually means: Enter secretly for espionage or disruption.
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We found 39 dictionaries that define the word infiltrate:

General (26 matching dictionaries)
  1. infiltrate: Merriam-Webster
  2. infiltrate: Oxford Learner's Dictionaries
  3. infiltrate: American Heritage Dictionary of the English Language
  4. infiltrate: Collins English Dictionary
  5. infiltrate: Vocabulary.com
  6. Infiltrate, infiltrate: Wordnik
  7. infiltrate: Cambridge Advanced Learner's Dictionary
  8. infiltrate: Wiktionary
  9. infiltrate: Webster's New World College Dictionary, 4th Ed.
  10. infiltrate: The Wordsmyth English Dictionary-Thesaurus
  11. infiltrate: Infoplease Dictionary
  12. infiltrate: Dictionary.com
  13. infiltrate: Online Etymology Dictionary
  14. infiltrate: Cambridge Essential American English Dictionary
  15. Infiltrate: Online Plain Text English Dictionary
  16. infiltrate: Webster's Revised Unabridged, 1913 Edition
  17. infiltrate: Rhymezone
  18. infiltrate: AllWords.com Multi-Lingual Dictionary
  19. infiltrate: Webster's 1828 Dictionary
  20. infiltrate: FreeDictionary.org
  21. infiltrate: Mnemonic Dictionary
  22. infiltrate: TheFreeDictionary.com
  23. infiltrate: Wikimedia Commons US English Pronunciations
  24. infiltrate: Longman Dictionary of Contemporary English

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

Computing (1 matching dictionary)
  1. infiltrate: Encyclopedia

Medicine (8 matching dictionaries)
  1. infiltrate: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. Infiltrate: MedTerms.com Medical Dictionary
  4. online medical dictionary (No longer online)
  5. Hepatitis C Information Central (No longer online)
  6. Infiltrate: Drug Medical Dictionary
  7. Hyperdictionary (No longer online)
  8. infiltrate: Medical dictionary

Miscellaneous (2 matching dictionaries)
  1. Navajo Code Talkers' Dictionary (No longer online)
  2. infiltrate: Idioms

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

(Note: See infiltrated as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
verb:  (ambitransitive) To surreptitiously penetrate, enter or gain access to.
verb:  (transitive) To cause to penetrate in this way.
verb:  (ambitransitive, of a liquid) To pass through something by filtration.
verb:  (transitive) To cause (a liquid) to pass through something by filtration.
verb:  (ambitransitive, medicine) To invade or penetrate a tissue or organ.
verb:  (transitive, military) To send (soldiers, spies, etc.) through gaps in the enemy line.
verb:  (intransitive, of an intravenous needle) To move from a vein, remaining in the body.
noun:  (pathology) Any undesirable substance or group of cells that has made its way into part of the body.

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