Usually means: Infiltrator secretly undermining from within.
Definitions Related words Mentions
We found 16 dictionaries that define the word fifth columnist:

General (15 matching dictionaries)
  1. fifth columnist: Merriam-Webster
  2. fifth columnist: Oxford Learner's Dictionaries
  3. fifth columnist: Collins English Dictionary
  4. fifth columnist: Vocabulary.com
  5. fifth columnist: Wordnik
  6. fifth columnist: Cambridge Advanced Learner's Dictionary
  7. fifth columnist: Wiktionary
  8. fifth columnist: Dictionary.com
  9. Fifth columnist: Wikipedia, the Free Encyclopedia
  10. fifth columnist: Rhymezone
  11. fifth columnist: FreeDictionary.org
  12. fifth columnist: Mnemonic Dictionary
  13. fifth columnist: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. fifth columnist: Encyclopedia

(Note: See fifth_column as well.)

Definitions from Wiktionary (fifth columnist)

noun:  someone who belongs to a group that secretly undermines another organization

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