vicennial

• 形容词，指每二十年发生一次的，或持续二十年的。在现代英语中较少使用。

An adjective describing something that occurs every twenty years, or lasts for a period of twenty years. It is rarely used in modern English.

1. Occurring every twenty yearsC2formal

   Happening or recurring once every twenty years.

   二十年一次的

   • The society holds a vicennial celebration for its founding members.
   • The vicennial census provides long-term demographic data.
   • They planned a vicennial reunion for the graduating class.