from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The eve of May Day, observed in some European countries and in some Scandinavian communities in the United States in celebration of spring and marked by music, singing, and bonfires.
- n. The eve of Beltane, believed by medieval Christians to be the occasion of a witches' Sabbath.
- n. An episode or a situation having the quality of nightmarish wildness.
Partial translation of German Walpurgisnacht : Walpurgis, Saint Walpurga (died 779) + Nacht, night.(American Heritage® Dictionary of the English Language, Fourth Edition)