quinquennialadj.
英 kwɪŋ'kwenɪəl | 美 kwɪn'kwɛnɪəl
中文adj. 每五年的；持续五年的\nn. 五周年纪念；五年期间；每五年发生一次的事件
每五年的；持续五年的
n. 五周年纪念；五年期间；每五年发生一次的事件
词根词源
quinquennial (adj.)late 15c., "lasting five years," from Latin quinquennis "of five years, celebrated every fifth year," from quinque- "five" (see quinque-) + ending from biennial, etc. Meaning "happening once every five years" attested from c. 1600. As a noun from 1895; earlier quinquennal (1610s).
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