■ noun
1》 a special anniversary, especially one celebrating twenty-five or fifty years of something.
2》 Jewish History a year of emancipation and restoration, kept every fifty years.
3》 a period of remission from the penal consequences of sin, granted by the Roman Catholic Church under certain conditions for a year, at intervals of twenty-five years.
Origin
ME: from OFr. jubile , from late L. jubilaeus (annus) '(year) of ~', based on Heb. yō ḇ ēl , orig. 'ram's-horn trumpet', with which the ~ was proclaimed.