zero-day

Fetched 2026-10-26 (cache).

Synonyms: zero, hero, aero, nero, mero, kero, ero, cero, zeno, xero, sero

Antonyms: zero, hero, aero, nero, mero, kero, ero, cero, zeno, xero, sero

Related words from Datamuse; suggestions, not definitions.

Adjective

1. {{lb|en|computing}} Of [[warez]], released less than a day after the official product release.
2. {{lb|en|computer security}} Of a [[vulnerability]], [[newly]] [[discover]]ed, and therefore still not [[fix]]ed and possibly [[exploit]]ed by [[hacker]]s or other [[criminal]]s.
3. {{lb|en|computer security}} Of an [[exploit]] or its [[threat]] or an [[attack]], [[benefit]]ing from a newly found and yet [[unpatched]] or [[unmitigated]] [[flaw]] in [[software]] or [[hardware]]; using a zero-day vulnerability.
4. {{&lit|en|zero|day}}

Noun

1. {{lb|en|computer security}} A [[vulnerability]] that has been discovered recently, and is yet [[unpatched]] or [[unmitigated]]; a zero-day vulnerability.
2. A day without [[obligation]]s, where one does not worry about being [[productive]].

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.