(literally) An owl (order Strigiformes) that is nocturnal. / (idiomatic) One who goes to bed late, or stays up late at night or in the early hours of the morning.

(obsolete) A loose robe worn as a nightgown.

(Germanic paganism) A festival celebrated by followers of Heathenry in late October or early November and based on the Germanic tradition of ancestor worship.

An Anglo-Saxon midwinter feast recorded by Bede, or a modern version of this festival celebrated by some Heathens.

The optic condition nyctalopia, the inability to see clearly in faint light, as at night

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

It's not very late (at night) and there's plenty of time.

All the time; round the clock; unceasingly.

An evening before a typical school day; normally a Sunday, Monday, Tuesday, Wednesday or Thursday night.

Alternative form of watchnight