ˌTwelfth ˈNight 1. the evening before the epiphany (6 January), which represents the end of the Christmas period. Christmas cards and decorations are usually taken down on Twelfth Night
2. a humorous play by William Shakespeare, which tells a complicated story about a young woman called Viola, who dresses as a boy to work as a servant of the Duke Orsino. Eventually she marries the Duke and finds her brother, Sebastian, whom she believed to be dead. → see also Malvolio