"night" as noun
1 - The period between sunset and sunrise, when a location faces far away from the sun, thus when the sky is dark.
2 - (Astronomy) The period of darkness beginning at the end of evening astronomical twilight when the sun is 18 degrees below the horizon, and ending at the beginning of morning astronomical twilight.
3 - (Legal) Often defined in the legal system as beginning 30 minutes after sunset, and ending 30 minutes before sunrise.
"night" as verb
1 - To spend a night (in a place), to overnight.
"night" as interjection
1 - Ellipsis of good night
