(astronomy) Any large aggregate of ordinary matter that does not emit light.

(astronomy, physics) dark matter comprising elementary particles whose composition is as yet unknown, but is presumed to be unlike normal protons, neutrons and electrons etc.

(Norse mythology) A member of the race of Dǫkkálfar, creatures who live underground.

(US) Standard form of all cats are grey in the dark.

(UK, sometimes vulgar and offensive) Sex is enjoyable regardless of the physical attractiveness or social station of one's partner.

A male given name from Irish. / A female given name from Irish.

A surname.

(slang, US) Used to denote compounding levels of dare "seriousness"; the escalation of a double dog dare.

Alternative spelling of pitch-dark

Absolutely dark or black; as dark as pitch.