triennial

• 每三年发生一次的；持续三年的。

Occurring every three years; lasting for three years.

1. Occurring every three yearsC1formal

   Happening once every three years.

   三年一次的

   • The triennial conference attracts experts from around the world.
   • The company holds a triennial review of its policies.
   • The triennial festival is a major cultural event in the region.

2. Lasting for three yearsC1formal

   Continuing or valid for a period of three years.

   三年的

   • The triennial contract was renewed after its expiration.
   • The plant has a triennial life cycle.
   • The triennial membership fee covers three years of access.

• 名词，指三百周年纪念或该纪念活动。

A noun referring to the 300th anniversary or the celebration of that event.

1. Three-hundredth anniversaryC2formal

   The 300th anniversary of an event, or the celebration of that anniversary.

   三百周年

   • The city is preparing for its triennial celebration next year.
   • The university marked its triennial with a grand ceremony.
   • A special coin was minted for the triennial of the founding.

   同义词tercentenarytercentennialtricentennial