What does the word nocturnal mean?

Usage examples for nocturnal

  1. Could he have been mistaken as to the purpose of that nocturnal visit to the courtyard? – The White Gauntlet by Mayne Reid
  2. By such means even the popular way of speaking of nocturnal visits made by the " vampire's ghost" is not so entirely unfounded as would appear at first sight, and the superstition is easily shown to be not altogether absurd, but to be based upon a small substructure of actual truth. – Modern Magic by Maximilian Schele de Vere
  3. I want to see if any of our possible suspects look as though they had been engaging in nocturnal journeys. – The Film Mystery by Arthur B. Reeve