1. The eve of the 1st of May when the old pagan witch-world was supposed to hold high revelry under its chief on certain high places, the Bracken especially, in Germany.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• qalpurgis night,
• aalpurgis night,
• salpurgis night,
• ealpurgis night,
• 3alpurgis night,
• 2alpurgis night,
• wzlpurgis night,
• wslpurgis night,
• wwlpurgis night,
• wqlpurgis night,
• wakpurgis night,
• wappurgis night,
• waopurgis night,
• walourgis night,
• wallurgis night,
• wal-urgis night,
• wal0urgis night,
• walpyrgis night,
• walphrgis night,
• walpjrgis night

The adjective form of the term "Walpurgis Night" would be "Walpurgian".

The plural form of "Walpurgis Night" is "Walpurgis Nights".

The singular form of "Walpurgis Night" is "Walpurgisnacht".