What is the meaning of double agent?

(DoD) Agent in contact with two opposing intelligence services, only one of which is aware of the double contact or quasi-intelligence services.
Department of Defense Dictionary of Military and Associated Terms. 31 January 2011.
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APAMilitary Dictionary (DoD). (2011). double agent. Retrieved September 20, 2026, from http://smartdefine.org/double_agent/definitions/1961452
ChicagoMilitary Dictionary (DoD). 2011. "double agent" http://smartdefine.org/double_agent/definitions/1961452 (accessed September 20, 2026).
HarvardMilitary Dictionary (DoD) 2011, double agent, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/double_agent/definitions/1961452>.
MLAMilitary Dictionary (DoD). "double agent" 4 April 2011. Web. 20 September 2026. <http://smartdefine.org/double_agent/definitions/1961452>
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