- the evening before Twelfth Day
- Twelfth Day or, specif., the evening of Twelfth Day
Twelfth NightTwelfth Night
(plural Twelfth Nights)
- A Christian festival marking the coming of Epiphany and concluding the Twelve Days of Christmas, traditionally falling on the evening of January 5 (i.e., on the eve of Twelfth Day, January 6), but also sometimes defined as falling on the evening of January 6 (i.e., on the evening of Twelfth Day itself).