noun

• (countable) The time when the Sun is below the horizon when the sky is dark.
  "Most animals are awake at day and sleep at night."
• (astronomy, countable) 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.
• (law, countable) A period of time often defined in the legal system as beginning 30 minutes after sunset, and ending 30 minutes before sunrise.
• (countable) An evening or night spent at a particular activity.
  "a night on the town"

verb

• (intransitive) To spend a night (in a place), to overnight.
  "So I took seat and ate somewhat of my vivers, my horse also feeding upon his fodder, and we nighted in that spot and next morning I set out[.]"

name

• (Germanic paganism) The goddess of the night in Heathenry.
  ""In this prayer, Sigdrifa calls upon powers of Nature - Day, Night, Earth - and the gods and goddesses as a group."