the period of darkness between sunset and sunrise.

the beginning of this period; nightfall.

the darkness of night; the dark.

a condition or time of obscurity, ignorance, sinfulness, misfortune, etc.

the long night of European history known as the Dark Ages.

( sometimes initial capital letter ) an evening used or set aside for a particular event, celebration, or other special purpose

a night on the town; poker night; New Year's Night.

of or pertaining to night

the night hours.

occurring, appearing, or seen at night

a night raid; a night bloomer.

used or designed to be used at night

to take a night coach; the night entrance.

working at night

night nurse; the night shift.

active at night

the night feeders of the jungle.

night and day

unceasingly; continually

She worked night and day until the job was done.

noun

day

noun

after dark , after hours , bedtime , before dawn , black * , blackness , dark , dark hours , darkness , dead of night , dim , duskiness , dusk to dawn , evening , eventide , gloom , midnight , nightfall , nighttide , nighttime , obscurity * , pitch dark , twilight , witching hour * , dusk , nocturnality , sundown

adjective

nocturnal