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zero-day (not comparable)

  1. (computing) Pertaining to the day on which software is released.
    • 2003, John Viega, Matt Messier, Secure Programming Cookbook for C and C++
      If your software is popular and has a high demand, you will want to defend against the "zero-day" cracker.
    • 2005, Valdes et al, Recent Advances in Intrusion Detection
      Automatically creating reliable signatures of zero-day exploits is the focus of intense research efforts.