What is the meaning of countersign?

(DoD, NATO) A secret challenge and its reply. See also challenge; password.
Department of Defense Dictionary of Military and Associated Terms. 31 January 2011.
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APAMilitary Dictionary (DoD). (2011). countersign. Retrieved September 21, 2026, from http://smartdefine.org/countersign/definitions/1961126
ChicagoMilitary Dictionary (DoD). 2011. "countersign" http://smartdefine.org/countersign/definitions/1961126 (accessed September 21, 2026).
HarvardMilitary Dictionary (DoD) 2011, countersign, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/countersign/definitions/1961126>.
MLAMilitary Dictionary (DoD). "countersign" 4 April 2011. Web. 21 September 2026. <http://smartdefine.org/countersign/definitions/1961126>
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