What is the meaning of top secret?

(DoD) See security classification.
Department of Defense Dictionary of Military and Associated Terms. 31 January 2011.
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APAMilitary Dictionary (DoD). (2011). top secret. Retrieved September 20, 2026, from http://smartdefine.org/top_secret/definitions/1964453
ChicagoMilitary Dictionary (DoD). 2011. "top secret" http://smartdefine.org/top_secret/definitions/1964453 (accessed September 20, 2026).
HarvardMilitary Dictionary (DoD) 2011, top secret, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/top_secret/definitions/1964453>.
MLAMilitary Dictionary (DoD). "top secret" 4 April 2011. Web. 20 September 2026. <http://smartdefine.org/top_secret/definitions/1964453>