night

n. 1 period of darkness between one day and the next; time from sunset to sunrise. 2 nightfall. 3 darkness of night. 4 night or evening appointed for some activity regarded in a certain way (last night of the proms). [old english]

n. That part of the natural day when the sun is beneath the horizon, or the time from sunset to sunrise; esp., the time between dusk and dawn, when there is no light of the sun, but only moonlight, starlight, or artificial light.