(computing, idiomatic) (of vulnerability) newly discovered, and therefore still not fixed and possibly exploited by hackers or other criminals

(computing, idiomatic) vulnerability that has been discovered recently, and is yet unpatched or unmitigated; zero-day vulnerability

(US) A day when one is permitted to not attend work in order to go on a vacation or attend to other matters.

One person's working time for a day, or the equivalent, used as a measure of how much work or labor is required or consumed to perform some task.

For a very long or seemingly endless time.

plural of Anzac Day

Current; of the present. / (informal) Designating a present-day version of someone or something in history.

(Roman Catholic Church) The Tuesday before Easter.

plural of day trip

plural of sports day