Usually means: Sudden increase in animal population.
Definitions Related words Mentions History
We found 23 dictionaries that define the word irruption:

General (18 matching dictionaries)
  1. irruption: Merriam-Webster
  2. irruption: Oxford Learner's Dictionaries
  3. irruption: Collins English Dictionary
  4. irruption: Vocabulary.com
  5. Irruption, irruption: Wordnik
  6. irruption: Wiktionary
  7. irruption: Infoplease Dictionary
  8. Irruption, irruption: Dictionary.com
  9. Irruption: Online Plain Text English Dictionary
  10. irruption: Webster's Revised Unabridged, 1913 Edition
  11. irruption: Rhymezone
  12. Irruption: AllWords.com Multi-Lingual Dictionary
  13. irruption: Webster's 1828 Dictionary
  14. irruption: FreeDictionary.org
  15. irruption: The Phrontistery - A Dictionary of Obscure Words
  16. irruption: Mnemonic Dictionary
  17. irruption: TheFreeDictionary.com
  18. irruption: Longman Dictionary of Contemporary English

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

Computing (1 matching dictionary)
  1. irruption: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. irruption: Medical dictionary

Science (1 matching dictionary)
  1. Bird On! (No longer online)

(Note: See irrupt as well.)

Definitions from Wiktionary (irruption)

noun:  The action of irrupting or breaking into; a violent entry or invasion; an inbreaking; an intrusion.
noun:  (ecology) An abrupt increase of an animal population.
noun:  (by extension) An abrupt increase in the size of a movement or organization.

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