Usually means: Vulnerability unknown to software maker.
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We found 7 dictionaries that define the word zero day:

General (6 matching dictionaries)
  1. zero-day: Oxford Learner's Dictionaries
  2. zero-day: The Word Spy
  3. Zero-Day, Zero-day, zero-day: Wordnik
  4. zero-day, zero day: Wiktionary
  5. zero-day, zero day: Dictionary.com
  6. Zero Day (Baldacci novel), Zero Day (David Baldacci novel), Zero Day (album), Zero Day (film), Zero-day (computing), Zero day (disambiguation), Zero day: Wikipedia, the Free Encyclopedia

Slang (1 matching dictionary)
  1. zero-day, zero day: Urban Dictionary

Definitions from Wiktionary (Zero day)

adjective:  (computing) Alternative spelling of zero-day [(computing) Of warez, released less than a day after the official product release.]
noun:  (computing) Alternative spelling of zero-day [(computing, idiomatic) A vulnerability that has been discovered recently, and is yet unpatched or unmitigated; a zero-day vulnerability.]

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