Definition of zero-day in English:

zero-day

Syllabification: ze·ro-day

adjective

Computing
  • Deriving from or relating to a previously unknown vulnerability to attack in some software: the service is designed to detect all manner of malware, including zero-day threats
    More example sentences
    • There were unexpected zero-day attacks causing a half-day network outage.
    • Last week, the company warned the public of a "zero-day" attack that acts upon certain weaknesses in the program.
    • The amalgamation of zero-day threats, compliance demands, and still more problems pushes corporations to address the most pressing challenges first.

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Pronunciation: ˈmeɪlstrəm
noun
a powerful whirlpool in the sea