Meaning

2 senses
  1. A vulnerability that has been discovered recently, and is yet unpatched or unmitigated; a zero-day vulnerability.

    New Internet Explorer zero-day exploited in Hong Kong attacks

  2. A day without obligations, where one does not worry about being productive.

Forms

plural: zero-days

See also

neighbours in the dictionary
zero-day — meaning, examples, forms, synonyms | Krumeto