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

plural of day trip

(US politics) The day on which general elections are held in the United States: the Tuesday following the first Monday in November.

The day on which a President and a Vice-President of the United States takes office, now on January 20 after a Presidential election, before 1936 on March 4.

For a very long or seemingly endless time.

(religion) The final and eternal judgment by God of all nations; Final Judgment. / (by extension) Any time or event at which responsibility will be assigned.

(Ireland, Wales, Isle of Man, Newfoundland) A celebration on December 26 where people, especially boys, hunt a fake wren and parade it upon a decorated pole.

The dawn.

(informal) Saint Patrick's Day

To gain complete victory or success over something or someone. / To be totally accepted by other people.