/ ˈdʒuːbɪliː; NAmE / noun
a special anniversary of an event, especially one that took place 25 or 50 years ago; the celebrations connected with it
—see also diamond jubilee , golden jubilee , silver jubilee
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WORD ORIGIN
late Middle English : from Old French jubile , from late Latin jubilaeus (annus) (year) of jubilee, based on Hebrew yōḇēl , originally ram's-horn trumpet, with which the jubilee year was proclaimed.