zero day

Main Entry:  zero day1
Part of Speech:  n
Definition:  the day on which a computer security vulnerability is exploited before security experts can address it
Etymology:  2000
Dictionary.com's 21st Century Lexicon
Main Entry:  zero day2
Part of Speech:  n
Definition:  a day when software, videos, music, or information is obtained prior to the day of public release; also called 0day
Dictionary.com's 21st Century Lexicon
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