What is the meaning of fifth columnist?

noun

  • A member of a clandestine subversive organization who tries to help a potential invader.
WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). fifth columnist. Retrieved September 20, 2026, from http://smartdefine.org/fifth_columnist/definitions/1230014
ChicagoWordNet. 2010. "fifth columnist" http://smartdefine.org/fifth_columnist/definitions/1230014 (accessed September 20, 2026).
HarvardWordNet 2010, fifth columnist, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/fifth_columnist/definitions/1230014>.
MLAWordNet. "fifth columnist" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/fifth_columnist/definitions/1230014>