(UK, regional) A nightjar, especially Caprimulgus europaeus (Eurasian nightjar). / (US) A New World nightjar of the genus Chordeiles, especially Chordeiles minor.

(US, law enforcement) A long narrow pole-like club carried by police and security personnel, for use in self-defense.

Clothing worn while sleeping in bed, such as pyjamas or a nightgown, and, when worn over nightclothes, a robe.

A long loose robe worn mainly by women for sleeping in. / A dressing gown.

Any of the poisonous plants belonging to the genus Solanum, especially black nightshade or woody nightshade.

Resembling a nightmare.

(cricket) a limited overs cricket match that starts in the afternoon and continues into the evening under floodlights

(informal) A military situation for which it is difficult to plan or organize the logistics.

Clothes worn at nighttime or in bed, such as pyjamas

Lasting a night (i.e. the duration of one night); lasting all night.