Usually means: Unauthorized entry into a system.
Definitions Related words Phrases Mentions Lyrics History Colors (New!)
We found 44 dictionaries that define the word intrusion:

General (27 matching dictionaries)
  1. intrusion: Merriam-Webster
  2. intrusion: Oxford Learner's Dictionaries
  3. intrusion: American Heritage Dictionary of the English Language
  4. intrusion: Collins English Dictionary
  5. intrusion: Vocabulary.com
  6. Intrusion, intrusion: Wordnik
  7. intrusion: Cambridge Advanced Learner's Dictionary
  8. intrusion: Wiktionary
  9. intrusion: Webster's New World College Dictionary, 4th Ed.
  10. intrusion: The Wordsmyth English Dictionary-Thesaurus
  11. intrusion: Infoplease Dictionary
  12. intrusion: Dictionary.com
  13. intrusion: Online Etymology Dictionary
  14. intrusion: Cambridge Essential American English Dictionary
  15. Intrusion (disambiguation), Intrusion (geology), Intrusion (novel), Intrusion (orthodontics), Intrusion: Wikipedia, the Free Encyclopedia
  16. Intrusion: Online Plain Text English Dictionary
  17. intrusion: Webster's Revised Unabridged, 1913 Edition
  18. intrusion: Rhymezone
  19. Intrusion: AllWords.com Multi-Lingual Dictionary
  20. intrusion: Webster's 1828 Dictionary
  21. intrusion: FreeDictionary.org
  22. intrusion: Mnemonic Dictionary
  23. intrusion: TheFreeDictionary.com
  24. intrusion: Wikimedia Commons US English Pronunciations
  25. intrusion: Longman Dictionary of Contemporary English

Business (5 matching dictionaries)
  1. intrusion: Merriam-Webster Legal Dictionary
  2. Glossary of Legal Terms (No longer online)
  3. Bouvier's Law Dictionary 1856 Edition (No longer online)
  4. Intrusion (geology), intrusion: Legal dictionary
  5. BusinessDictionary.com (No longer online)

Computing (2 matching dictionaries)
  1. intrusion: Webster's New World Hacker Dictionary
  2. Intrusion (geology), intrusion: Encyclopedia

Medicine (4 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)
  2. Orthodontic Terms (No longer online)
  3. online medical dictionary (No longer online)
  4. Intrusion (geology), intrusion: Medical dictionary

Religion (1 matching dictionary)
  1. Intrusion: Catholic Encyclopedia

Science (2 matching dictionaries)
  1. intrusion: Dictionary of Geology
  2. intrusion: Natural History Terms

Tech (3 matching dictionaries)
  1. AUTOMOTIVE TERMS (No longer online)
  2. DOD Dictionary of Military Terms (No longer online)
  3. Space and Electronic Warfare Lexicon (No longer online)

(Note: See intrusions as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  The forcible inclusion or entry of an external group or individual; the act of intruding.
noun:  (geology) Magma forced into other rock formations; the rock formed when such magma solidifies.
noun:  A structure that lies within a historic district but is nonhistoric and irrelevant to the district.
noun:  (phonology) The insertion of a phoneme into the pronunciation of a word despite its absence from the spelling. (e.g. intrusive r)
noun:  (psychology) An involuntarily arising idea or memory that is nuisant and falsifies an accurate impression of the world.

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