¹ night noun

• the time of darkness between one day and the next : the part of the day when no light from the sun can be seen and most people and animals sleep
• the darkness that occurs during the nighttime
• the final part of the day that is usually after work, school, etc., and before you go to bed : the early part of the night : evening

² night adjective

• of or relating to the night
• for use at night
• happening at night