Definitions from Wiktionary (zero-day)

▸ adjective:  (computing) Of warez, released less than a day after the official product release.
▸ adjective:  (computing) Of a vulnerability, newly discovered, and therefore still not fixed and possibly exploited by hackers or other criminals.
▸ adjective:  (computing) Of an exploit or its threat or an attack, benefiting from a newly found and yet unpatched or unmitigated flaw in software or hardware; using a zero-day vulnerability.
▸ adjective:  Used other than figuratively or idiomatically: see zero, day.
▸ noun:  (computing, idiomatic) A vulnerability that has been discovered recently, and is yet unpatched or unmitigated; a zero-day vulnerability.



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