Definition of "zero-day" []

• Pertaining to the day on which software is released. (adjective)

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• "This is called a "zero-day flaw", and it's not quite as simple as just changing the clock; developers did plan and guard against anyone doing something that obvious."
• "Apple has not yet offered a patch for the vulnerability, known as a "zero-day" weakness because the company has not been informed ahead of time of the weakness."
• "Latest Microsoft zero-day attack may come from gamers"