Halloween n 1: the evening before All Saints' Day; often devoted to pranks played by young people [syn: {Halloween}, {Hallowe'en}, {Allhallows Eve}]
Halloween \Hal`low*een"\ (h[a^]l`l[-o]*[=e]n"), n. The evening preceding Allhallows or All Saints' Day (November 1); also the entire day, October 31. It is often marked by parties or celebrations, and sometimes by pranks played by young people. [Scot.] --Burns. Syn: Hallowe'en, Allhallows Eve. [1913 Webster + WordNet 1.5]