quadrennialadj.
英 kwɒ'drenɪəl | 美 kwɑd'rɛnɪəl
中文adj. 每四年一次的；连续四年的\nn. 第四周年纪念
每四年一次的；连续四年的
n. 第四周年纪念
词根词源
quadrennial (adj.)1650s, "lasting four years;" as "happening once every four years," 1701; from quadri- + ending from biennial, etc. Correct formation would be quadriennial (compare Latin quadriennium "period of four years"). As a noun from 1640s. Related: Quadrennially.
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