Definitions for fifth columnist
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Random House Webster's College Dictionary
fifth′ col′umn(n.)
a group of people who act traitorously and subversively out of a secret sympathy with an enemy of their country.
Category: Government
(originally) Franco sympathizers in Madrid during the Spanish Civil War: the insurgents had four columns marching on Madrid and a “fifth column” of supporters already in the city.
Category: Government
fifth′ col′umnist(n.)
Princeton's WordNet
fifth columnist, saboteur(noun)
a member of a clandestine subversive organization who tries to help a potential invader
Wiktionary
fifth columnist(Noun)
someone who belongs to a group that secretly undermines another organization
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"fifth columnist." Definitions.net. STANDS4 LLC, 2013. Web. 19 Jun 2013. <http://www.definitions.net/definition/fifth columnist>.