Definition of zero-day in English:
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
- The point seemed to be to create a zero-day exploit, which he didn't have a chance of managing.
- We're offering zero-day protection, stability, and configuration control.
- There were unexpected zero-day attacks causing a half-day network outage.
Definition of zero-day in:
- British & World English dictionary
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