noun (n)

• the time after sunset and before sunrise while it is dark outside(noun.time)

  Synonym:
  dark, nighttime
  Antonym:
  day, daylight, daytime
  

  source: wordnet30
• a period of ignorance or backwardness or gloom(noun.time)

  source: wordnet30
• the period spent sleeping(noun.time)

  Example:
  I had a restless night.
  

  source: wordnet30
• the dark part of the diurnal cycle considered a time unit(noun.time)

  Example:
  Three nights later he collapsed.
  

  source: wordnet30
• darkness(noun.state)

  Example:
  It vanished into the night.
  

  source: wordnet30
• a shortening of nightfall(noun.time)

  Example:
  They worked from morning to night.
  

  source: wordnet30
• the time between sunset and midnight(noun.time)

  Example:
  He watched television every night.
  

  source: wordnet30
• Roman goddess of night; daughter of Erebus; counterpart of Greek Nyx(noun.person)

  Synonym:
  nox
  

  source: wordnet30
• 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.(noun)

  source: webster1913