(Britain, Ireland) A day on which a registered charity raises money, usually by selling small lapel flags. / (software) A day designated for changing to an incompatible system.

A day in a liturgical calendar that is observed in honour of a saint; not necessarily a holiday.

Victory in Europe day; the anniversary of the end of the Second World War in Europe, 8 May 1945.

(law) A day on which a court is open.

A US national holiday celebrated on the second Monday in October, for Christopher Columbus' arrival in the Americas.

A day in which an employee is not scheduled to work. / A day in which a person is not performing up to their usual level of ability.

the next day.

(childish) A contrived holiday on which everything is done backwards, for example "yes" means "no".

Synonym of chalk and cheese (“two things that are very different”)

All the time; round the clock; unceasingly.