/ Dictionary / Index T Twelfth Night: Meaning and Definition of Find definitions for: Twelfth' Night' Pronunciation: [key] the evening before Twelfth Day, formerly observed with various festivities. the evening of Twelfth Day itself. (italics) a comedy (1602) by Shakespeare. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Twelfth Day Twelfthtide Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language