What is the meaning of passive?

(DoD, NATO) In surveillance, an adjective applied to actions or equipments which emit no energy capable of being detected.
Department of Defense Dictionary of Military and Associated Terms. 31 January 2011.
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APAMilitary Dictionary (DoD). (2011). passive. Retrieved September 20, 2026, from http://smartdefine.org/passive/definitions/1963261
ChicagoMilitary Dictionary (DoD). 2011. "passive" http://smartdefine.org/passive/definitions/1963261 (accessed September 20, 2026).
HarvardMilitary Dictionary (DoD) 2011, passive, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/passive/definitions/1963261>.
MLAMilitary Dictionary (DoD). "passive" 4 April 2011. Web. 20 September 2026. <http://smartdefine.org/passive/definitions/1963261>
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