What is the meaning of zero hour?

noun

  • The time set for the start of an action or operation. .
WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). zero hour. Retrieved September 20, 2026, from http://smartdefine.org/zero_hour/definitions/1325876
ChicagoWordNet. 2010. "zero hour" http://smartdefine.org/zero_hour/definitions/1325876 (accessed September 20, 2026).
HarvardWordNet 2010, zero hour, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/zero_hour/definitions/1325876>.
MLAWordNet. "zero hour" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/zero_hour/definitions/1325876>