quinquennial
/kwɪŋˈkwenɪəl/adjective
1- recurring every five years每五年出现一次的。
1.1
- lasting for or relating to a period of five years（持续）五年的。
派生词
quinquennially
adverb词源
late 15th cent. （in the sense 'lasting five years'）： from Latin quinquennis （from quinque 'five'+annus 'year'）+-AL.