Noun
1. the time after sunset and before sunrise while it is dark outside
2. the time between sunset and midnight;
"he watched television every night"3. the period spent sleeping;
"I had a restless night"4. the dark part of the diurnal cycle considered a time unit;
"three nights later he collapsed"5. darkness;
"it vanished into the night"6. a shortening of nightfall;
"they worked from morning to night"7. a period of ignorance or backwardness or gloom