The dawn.

Alternative spelling of dayee

(Australia, Britain, New Zealand) A day on which school pupils are allowed to wear casual clothes which would on any other day be against the school's uniform policy.

For a very long or seemingly endless time.

(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

plural of day trip

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.

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

(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.