词典释义：
释义
n.
a special anniversary of an event, especially one celebrating twenty-five or fifty years of a reign or activity
（尤指庆祝２５周年或５０周年的）周年纪念
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[as modifier]
jubilee celebrations .５０周年纪念庆典。
【犹太史】 五十年节，禧年（每隔５０年一次的圣年，该年奴隶获释、抵押的土地归还原主）。
a period of remission from the penal consequences of sin, granted by the Roman Catholic Church under certain conditions for a year, usually at intervals of twenty-five years
（罗马天主教会特许、通常每２５年一次、对罪孽免予处罚的）大赦年。
词源
"late Middle English： from Old French